Choosing an island in the Hauraki Gulf

The gulf, briefly

The Hauraki Gulf — Tīkapa Moana — wraps around Auckland's eastern side and contains more than fifty islands. Some are suburbs. Some are farms. Some are among the most tightly protected conservation land in New Zealand, with biosecurity rules that mean your bag gets checked before you board.

For a visitor with a day to spend, the realistic shortlist is short: Rangitoto, Tiritiri Matangi, Motutapu, Motuihe, and Waiheke. Waiheke is a different kind of day altogether — wine, restaurants, beaches — and we cover it separately. This piece is about the other four.

The Hauraki Gulf Marine Park, and why the birds are back

The reason the gulf works as a wildlife destination is a deliberate, decades-long, and expensive programme, and it is worth understanding before you get on a boat.

The Hauraki Gulf Marine Park was established in 2000, covering the gulf, its islands and its catchments — around 1.2 million hectares. It is not a no-take reserve; it is a management framework that sits over a working seascape with fishing, shipping and a city of 1.7 million on its edge. Within it sit a number of fully protected marine reserves, including Goat Island near Leigh, New Zealand's first, established in 1975.

The island restorations are the visible part. Rangitoto and Motutapu were cleared of seven pest species in a single operation completed in 2011 — at the time the largest multi-species eradication attempted on an inhabited island group anywhere. Tiritiri Matangi was replanted by volunteers from 1984 and cleared of kiore. Motuihe, Rotoroa and others have followed. The result is a chain of pest-free islands close enough to the mainland to act as reservoirs for species that cannot survive on it.

What you actually see because of that:

• Seabirds. The gulf is one of the most seabird-rich bodies of water on earth, with something over seventy species recorded and around a quarter of the world's seabird species breeding in New Zealand. Watch for shearwaters and petrels working the water on any crossing.
• Bryde's whales, resident year-round in the gulf in small numbers, and vulnerable to ship strike — which is why vessels observe a voluntary speed limit.
• Common and bottlenose dolphins, frequently seen from ferries.
• Orca, which come into the inner harbour to hunt rays, occasionally within sight of the city.
• Land birds on the sanctuary islands that are effectively gone from the mainland.

The gulf is not in good shape overall — successive state-of-the-environment reports have been blunt about declining fish stocks, sediment and shellfish beds. The islands are the bright spot, and the biosecurity checks at the wharf are the price of keeping them that way.

Rangitoto: the volcano you can climb before lunch

Rangitoto is the low, almost perfectly symmetrical cone that sits in every photograph ever taken of the Auckland waterfront. It is the youngest and largest of the roughly fifty volcanoes in the Auckland volcanic field, and it erupted from the sea only about 600 years ago — recently enough that Māori living on neighbouring Motutapu witnessed it, and their footprints have been found preserved in the ash.

That youth is the thing that makes Rangitoto strange to walk on. The island is essentially a raw lava field with a forest growing straight out of it. There is no soil to speak of. The surface is black scoria that clinks underfoot like broken pottery, and out of it grows the largest pōhutukawa forest in the world, with roots gripping bare rock. Nothing else near Auckland looks remotely like it.

The ferry from downtown takes about 25 minutes. From the wharf, the summit track climbs to the crater rim in roughly an hour at a steady pace — not technically difficult, but relentless, exposed and hot, over rough uneven rock. The reward at the top is a full 360-degree view: the city skyline, the gulf, Waiheke, the Coromandel on a clear day. Coming down, the lava cave detour is worth the twenty minutes if you have a torch.

• There is no water on the island. None. Carry at least a litre and a half per person in summer.
• No shop, no café, no accommodation. Bring everything.
• Proper shoes. The scoria is sharp and ankle-rolling. Jandals are a genuinely bad idea.
• Watch the last ferry. There is no way off outside the timetable, and people do get caught.
• Biosecurity: Rangitoto and Motutapu are pest-free. Check your bag for stowaway rodents and seeds, and stay on the tracks.

Rangitoto's baches, and the strangest suburb in Auckland

Halfway around the coastal track at Rangitoto Wharf and Islington Bay there is something that surprises almost everyone: houses.

From the 1920s and 1930s, Aucklanders built holiday baches on the lava flats at Rangitoto — small, hand-built, corrugated-iron-and-fibrolite cottages put up with whatever could be carried over on a boat. At the peak there were around 140 of them. They were built on land held under licence rather than owned, and from the late 1930s no new construction was permitted; as licences expired, most were removed.

About thirty survive. They are now recognised as a heritage precinct — a nearly unique surviving example of an early twentieth-century New Zealand bach settlement, restored and maintained by a volunteer trust. One is open to the public as a museum on set days.

Walking through them is genuinely strange. You have just come down from a bare volcanic summit, and here is a street of tiny painted cottages with hand-lettered names, water tanks, and gardens growing out of scoria, with nobody in them. It is one of the more atmospheric things in Auckland and it is completely free.

The tracks around the island:

• Summit Track — the main event, about an hour up from the wharf, with a boardwalk section at the top and a 360-degree crater-rim view.
• Lava Caves — a short signposted detour off the summit track through tubes formed as the outside of a lava flow cooled while the inside kept moving. Bring a torch and expect to duck.
• Coastal Track — a gentler option around the shore to Islington Bay, past the baches, for anyone who does not want the climb.
• McKenzie Bay and the causeway — the long way round to Motutapu, about two hours.
• Wilsons Park Track — a short loop through the pōhutukawa forest that shows how the island is slowly building soil out of bare rock.

There is also a road-train service from the wharf toward the summit for visitors who cannot manage the walk — check whether it is running before relying on it.

Tiritiri Matangi: the one for birds

If Rangitoto is a geology lesson, Tiritiri Matangi is a conservation one, and it is arguably the more extraordinary day.

Tiri was farmed down to about six per cent native bush cover. From 1984, volunteers hand-planted hundreds of thousands of trees, rats were eradicated, and threatened birds were reintroduced. The result is an open sanctuary where species that are effectively extinct on the mainland — takahē, kōkako, hihi (stitchbird), tieke (saddleback), korimako, and little spotted kiwi — live in numbers, in daylight, close to the path.

The volume is what surprises people. Visitors who have never noticed birdsong find themselves standing still on the track because the noise is genuinely overwhelming. Takahē wander near the visitor centre with the indifference of chickens.

The ferry runs on limited days — typically Wednesday through Sunday, and it does not sail every day of the week — so this is one to build the trip around rather than slot in. It takes about 75 minutes from downtown Auckland, with a stop at Gulf Harbour on the Whangaparaoa Peninsula. Book well ahead in summer; sailings sell out. Guided walks with the volunteer guides cost a modest extra and are worth every cent, because they know where the kōkako territory is and you will not.

Same rules: bring your own food and water, wear walking shoes, and expect strict biosecurity checks before boarding.

Ferries, fares and the timetable trap

Almost every problem people have with a Hauraki Gulf day comes down to the timetable, so it is worth being systematic about it.

Where they leave from. Everything visitor-facing departs the Downtown Ferry Terminal on Quay Street, a two-minute walk from Britomart. Fullers360 runs Waiheke, Rangitoto and most of the gulf services; Auckland Transport contracts the commuter routes. The Waiheke visitor fares sit outside the AT HOP system, but most other services accept HOP or contactless.

How often. Waiheke is frequent — up to 22 sailings on peak days. Rangitoto is not: typically a small number of daily departures, with the last return in mid to late afternoon. Tiritiri Matangi runs on selected days only, generally Wednesday to Sunday rather than daily, and it is a single return service.

This is the trap. Waiheke forgives a missed boat; Rangitoto and Tiritiri Matangi do not. There is no later sailing, no water taxi on standby and, on Rangitoto, nowhere to buy so much as a bottle of water while you work out what to do. People get caught every summer.

The rules that prevent it:

• Book online in advance for Rangitoto and Tiritiri Matangi. Tiri sells out over summer.
• Note the last return time before you leave the wharf, and set an alarm for an hour before it.
• Allow more than you think for the walk back — downhill on scoria is slower than it looks, and legs are tired.
• Check the forecast the night before. Strong winds cancel gulf sailings at short notice, and that is a real risk on a fixed itinerary.
• Have a mainland alternative ready. If the boat is cancelled, the Devonport ferry runs in almost all conditions and the Domain does not close.

Motutapu and Motuihe: the quiet two

Motutapu is joined to Rangitoto by a causeway and is its complete opposite — 178 million years old against Rangitoto's 600, rolling green farmland against black lava. You can walk from the Rangitoto wharf across to Home Bay on Motutapu in about two hours, and there is a Department of Conservation campsite there if you want to stay. Restoration planting has been going on for decades, and takahē and other species have been reintroduced. It is a good option if the Rangitoto summit sounds like more climbing than you want.

Motuihe sits between Motutapu and Waiheke and is the gentlest island day in the gulf: two long sandy swimming beaches at the narrow waist of the island, easy walking tracks, and a restoration project that has brought back tieke and kiwi. Ferry services are limited and seasonal, so check before planning around it. On a hot February day it is the best swimming of any of the gulf islands and there is almost nobody there.

Kawau Island, further north near Sandspit, is a different trip again — the historic Mansion House, wallabies imported in the 1860s, and a mail-run boat that visits the bays. It is reached by road from Auckland rather than by ferry from downtown, so it is a full-day excursion rather than a harbour hop.

The far gulf: Kawau, Great Barrier and Rakino

Beyond the day-trip islands, the Hauraki Gulf keeps going, and two of the outer islands are worth knowing about even if you do not reach them this trip.

Great Barrier Island / Aotea is the big one — about 90 kilometres north-east of the city, roughly 285 square kilometres, and genuinely remote. There is no reticulated power supply; the island runs on solar, generators and rainwater tanks. In 2017 it became the world's first island to be certified as an International Dark Sky Sanctuary, and on a clear moonless night the sky over Aotea is as good as anywhere accessible in the country. Getting there is a four-and-a-half-hour ferry or a thirty-minute flight, and it is an overnight destination rather than a day trip — three nights is the sensible minimum.

Kawau Island sits closer in, off Sandspit near Warkworth, about an hour's drive north of Auckland and then a short boat ride. Its centrepiece is Mansion House, the residence of Sir George Grey, twice Governor and later Premier, who bought the island in 1862 and filled it with introduced plants and animals. Several species of wallaby he brought from Australia are still there and still a management problem. The Royal Mail Run — a working postal boat that calls at the bays — is the best way to see it, and takes about four hours.

Rakino is a small, quiet, largely residential island east of Motutapu with a limited ferry service, a couple of beaches, no shop and almost no visitors. Mentioned mainly so you know it exists.

For a first Auckland visit, none of these should displace Rangitoto, Tiritiri Matangi or Waiheke. For a second visit, or for anyone with a week rather than three days, Aotea is the one that will change how you think about the region.

Which island suits which day

• Short on time, want the classic Auckland view? Rangitoto. Half a day, a proper climb, an unbeatable summit panorama.
• Interested in wildlife or conservation? Tiritiri Matangi, without hesitation. Plan the trip around the sailing days.
• Travelling with young children or anyone who does not want to climb? Motuihe for the swimming, or Motutapu's easier walking.
• Want wine, restaurants and a village? Waiheke.
• Second visit, want somewhere quiet? Motutapu's Home Bay, or Kawau.

One thing worth saying plainly: none of these islands has a shop. Not one of them. Every year people arrive on Rangitoto at 10am with no water and are unhappy by noon.

When to go, and reading the weather

The gulf is at its best from November to April, and February and March are the sweet spot — the sea is at its warmest, the weather has settled, and the school holidays are over.

Rangitoto in the middle of summer is hot work. The lava field radiates heat, there is very little shade on the summit track, and the black rock does not help. If you are climbing in January or February, take the earliest ferry and be at the top by mid-morning.

Winter has its own case. The islands are quiet, the light is beautiful, and Tiritiri Matangi's birds are perfectly active. What you lose is swimming and the reliability of the sailings — strong winds cancel gulf ferries with little notice, and that is a real risk on a tight itinerary.

Check the forecast the night before, and if the wind is up, have a mainland plan.

The bag check, and why it matters

You will be asked to check your bag before boarding for the pest-free islands, and there will be signs asking you to look for rodents, ants, soil and seeds. It can feel like theatre. It is not.

These islands are pest-free because someone did the enormously expensive work of making them so, and a single pregnant rat arriving in a backpack can undo decades. Rangitoto and Motutapu were cleared of seven pest species in a single operation. Tiritiri Matangi's birds exist in those numbers because nothing eats their eggs.

So: check the bag properly, clean the mud off your boots, take your rubbish home, stay on the tracks, and do not feed anything. It is a small courtesy for access to something genuinely rare.

What to carry, and the mistakes that spoil an island day

Gulf island days go wrong in a small number of predictable ways, almost all of them solvable before you leave the hotel.

• Water. Rangitoto, Motutapu, Motuihe and Tiritiri Matangi have no shop and no reliable drinking water. A litre and a half per person in summer, minimum. This is the single most common mistake.
• Food. Same reason. Sandwiches, fruit, something salty. Take the wrappers home.
• Proper shoes. Rangitoto's scoria is sharp, loose and ankle-rolling, and the summit track is uneven the whole way. Jandals are genuinely unsafe on it.
• Sun protection. New Zealand's UV is severe, the lava field radiates heat, and there is little shade on the Rangitoto summit track. Hat, high-factor sunscreen, and a long-sleeved layer.
• A rain shell. The gulf changes fast and there is nowhere to shelter.
• A torch for Rangitoto's lava caves.
• Binoculars for Tiritiri Matangi, if you have them. Not essential — the birds come close — but they change the day.
• A charged phone, noting that coverage is patchy and the last ferry does not wait.

And the biosecurity check before boarding: open every pocket, look for seeds, soil and stowaways, and clean the mud off your boots. It takes two minutes and it is the reason any of this is worth doing.