The three big islands of the Gulf of Thailand sit close enough to visit in a single trip and far enough apart in character that picking the wrong one can sour a whole holiday. Samui is the polished one with the airport. Phangan is the one with the party and, increasingly, the yoga retreats. Tao is the small one that gets sold as a dive destination but offers far more than that. They are usually packaged as a trio, but most people don't have two weeks, and even those who do tend to fall hard for one and tolerate the others.
Here is how to choose, what each island actually feels like in 2026, and how to string them together if you want all three.
The short answer
Pick Koh Samui if you want a proper holiday with minimal logistics, a decent restaurant scene, and the option of a nice hotel rather than a bungalow. It's the only one with an airport, and after the White Lotus effect it has tilted further upmarket.
Pick Koh Phangan if you want the best big beaches of the three, a strong wellness and yoga scene around Srithanu, and the option (not the obligation) of the Full Moon Party at Haad Rin. It rewards travellers who'll rent a scooter and explore.
Pick Koh Tao if you want the most variety per square kilometre of the three. It's small, hilly and covered in viewpoints, has some of the prettiest beaches in the Gulf, and happens to be one of the cheapest places in the world to learn to dive if you're so inclined. A week here is easy to fill.
Koh Samui: the easy one
Samui is the second-largest island in Thailand and feels more like a small town than a tropical hideaway in places. Chaweng Beach is the busy strip with the bars, clubs and most of the mid-range hotels. Lamai is quieter but similar in shape. Bophut's Fisherman's Village is the prettier corner, full of boutique hotels and restaurants. The northeast coast around Choeng Mon is where the upmarket resorts cluster, including the Four Seasons that stood in for the fictional resort in The White Lotus season three.
That show has changed Samui's trajectory. Hotel rates climbed roughly 10% in the weeks around the premiere, short-term rental bookings in Thailand surged, and the Tourism Council of Thailand reported an 88% jump in searches for the island. Bookings are up most from the UK, Germany and France. The practical effect for you is that Samui in 2026 is busier and pricier than it was two years ago, particularly at the top end. It's still possible to do it cheaply, but you'll feel the squeeze around Chaweng during the Christmas-to-February peak.
What Samui does well: easy arrivals (direct flights from Bangkok, Phuket, Singapore, Hong Kong and Kuala Lumpur), decent food beyond the standard tourist Thai, proper hospitals, and a wide enough spread of accommodation that you can holiday on £40 a night or £400. What it does less well: a sense of place. Big stretches of the coast are wall-to-wall resort, and the beaches, while fine, aren't the best in this corner of Thailand. Water shortages are a recurring issue the local infrastructure is still catching up with.
Best for: couples, families, anyone short on time, anyone who wants a hotel rather than a bungalow, first-time visitors to Thailand who don't want to overthink the logistics.
Skip if: you're looking for a small, untouched island. Samui stopped being that around 2005.
Koh Phangan: the one with range
Phangan gets sold on the Full Moon Party, which obscures how varied the rest of the island actually is. Haad Rin in the south is the party end and stays busy on the run-up to each full moon. The Full Moon Party itself is alive and well in 2026 (entry is 200 baht, paid in cash at the beach gates, and the official dates have shifted to align with the actual full moon now that the Buddhist holiday alcohol ban has been adjusted). Around 20,000 people show up most months. New Year's Eve doubles that.
But the rest of Phangan is a different island entirely. Srithanu on the west coast is the wellness hub, with yoga schools, vegan cafés, plant medicine retreats and a slower pace. The north coast holds the best beaches: Bottle Beach, Haad Salad, and Haad Yao, all of which take some effort to reach (a steep scooter ride or a longtail boat) and reward the effort. The interior is jungle and waterfalls.
Practically, you fly into Samui and take a ferry. The Lomprayah catamaran from Maenam Pier on Samui to Thong Sala on Phangan takes about 30 minutes and costs around 600 baht. There are half a dozen other operators if Lomprayah is full. Accommodation runs from 500 baht for a basic bungalow up to 1,500-plus for somewhere more comfortable, with proper resorts at the top end including a Shangri-La in the north. Scooter rental is straightforward but the agencies on Phangan are stricter about deposits and passports than elsewhere, which is a sensible thing to be aware of rather than a reason to avoid renting.
Best for: travellers who want variety, anyone interested in yoga or wellness, people who want the option of a big party night without committing the whole trip to it, scooter-confident travellers willing to explore.
Skip if: you're squeamish about scooters (you'll need one for the good beaches), or you want luxury without compromise (it exists here but the choice is much narrower than on Samui).
Koh Tao: the small one that punches above its weight
Tao is 21 square kilometres of granite hills, hidden coves and viewpoints, and yes, it happens to also be one of the best places in the world to learn to dive. But the diving reputation has done Tao a disservice by flattening it into a one-line pitch. The island has more variety per square kilometre than either of its bigger neighbours, and once you're on a scooter you can be at a different beach or viewpoint every hour.
Start with the viewpoints, because Tao's hilly shape means it's covered in them. John-Suwan in the south is the famous one, a fifteen-minute scramble up to a granite outcrop with a near-360-degree view over Chalok Baan Kao, Shark Bay and Thian Og. Mango Bay Viewpoint in the north looks down over one of the prettier bays. Fraggle Rock above Sai Nuan is quieter and gets you a lovely western view for sunset. Two View does what the name suggests, with Sairee on one side and Tanote on the other. None of these take more than half an hour to walk and most of them are free or charge a small 50-baht trail fee that goes towards upkeep.
The beaches are better than they get credit for. Sairee is the long main one on the west coast, 1.8 km of sand with the bars and dive schools behind it and a properly good sunset every evening. Freedom Beach in the south is small, soft and turquoise, reached by a short walk through a resort. Tanote Bay on the east coast has big granite boulders you can jump off and some of the best snorkelling straight from the sand. Sai Nuan, between Mae Haad and Chalok, is two small linked coves that most day-trippers never find. Shark Bay lives up to the name: blacktip reef sharks cruise the shallows most mornings, and you can swim with them from the beach with a mask and fins.
Then there's Koh Nang Yuan, the famous joined-sandbar islet ten minutes offshore by longtail. It's one of the most photographed spots in Thailand for a reason. Get there early (the day-tripper boats from Samui arrive around 11am and leave by 3pm), pay the 100-baht entrance fee, climb the short trail to the viewpoint, and have the place largely to yourself for an hour.
Getting around is easier than people make out. Tao is small enough that scooter journeys are short, the main loop road is paved, and most of the places you'd want to reach are signposted in English. There are a couple of steep, rougher tracks (the road down to Tanote is the one most often cited) and you should not learn to ride a scooter here, but if you've ridden anywhere else in Southeast Asia you'll be fine. Rentals run 200 to 300 baht a day. If you really don't want to ride, songthaews and water taxis cover the main spots, and Mae Haad to Sairee is a flat 15-minute walk along the beach.
The diving, since it would be perverse not to mention it: a four-day PADI Open Water course in 2026 costs around 9,500 to 12,000 baht (roughly £220 to £280), gear and certification included, and most schools throw in cheap or free accommodation while you train. Fun dives for certified divers start at around 800 baht. The island certifies more new divers per year than almost anywhere on earth, second only to Cairns. But you can have an excellent week on Tao without ever putting on a regulator.
Where to base yourself: Mae Haad is the ferry town and the most practical for a short stay. Sairee is where the energy is, with the bars, beach restaurants, and most of the dive schools. Chalok Baan Kao in the south is quieter, more family-friendly and within walking distance of John-Suwan and Freedom Beach. The boutique end of Tao's accommodation is worth seeking out: places like Cape Shark Villas and Koh Tao Heights have proper sea-view pool villas at a fraction of Samui's prices.
Best for: divers and snorkellers, yes, but also viewpoint hunters, scooter explorers, sunset chasers, anyone who wants a small island that still has plenty to fill a week.
Skip if: you want big resorts with kids' clubs, a lively after-midnight bar scene, or you genuinely won't get on a scooter (it's still doable, but you'll see less of what makes the island special).
Getting between them
The ferry network is reliable and doesn't need overthinking. Lomprayah is the main operator, but Seatran, Songserm and Raja Ferry all run similar routes, and any travel agent on any of the three islands can sell you a ticket the day before.
Rough costs and times in 2026:
- Samui to Phangan: 30 minutes by catamaran, around 600 baht
- Phangan to Tao: about 1 hour, around 600 baht
- Samui to Tao (direct, via Phangan): around 1.5 to 2 hours, 700 baht for the standard catamaran or 550 baht for the slower Laemsor ferry
Morning departures are calmer at sea and less likely to be delayed by weather. Aim for 8am or thereabouts and you'll arrive with the afternoon free. Each ferry company gives you a coloured sticker at check-in (it tells the crew where you're getting off), which is your friend. Don't lose it.
How to do all three in 10 days
If you have the time and want the full set, the order matters because of how the airport works.
Days 1-3: Koh Samui. Fly in, decompress at a beach hotel, eat well, take the half-day Ang Thong Marine Park trip if the weather is good. Don't try to "do" Samui beyond this; it's your soft landing.
Days 4-6: Koh Phangan. Catamaran across in the morning. Stay on the west coast (Srithanu or Haad Yao) rather than at Haad Rin unless you're specifically there for the Full Moon Party. Rent a scooter on day two and find Bottle Beach.
Days 7-9: Koh Tao. Catamaran up. Spend a morning at Koh Nang Yuan before the day-tripper boats arrive, walk up to John-Suwan for sunset, snorkel from Tanote Bay, and find Sai Nuan if you want a beach to yourself. If you're going to dive, book your course as soon as you arrive.
Day 10: Back to Samui for the flight home. Don't book a same-day connection; ferries get cancelled in bad weather and you don't want to be the person sprinting through Samui airport after a missed boat. Stay one night near Mae Nam pier, fly out the next morning.
If you only have a week, drop one island. The honest answer about which to drop depends on you: skip Samui if you want adventure and don't mind a bumpy ferry transfer from Surat Thani; skip Phangan if you have small children and want a proper hotel base; skip Tao only if you really don't fancy a scooter and aren't drawn to the water at all.
A few practical things
Thailand introduced a Digital Arrival Card from May 2025 that all visitors need to complete before arrival, online. The 300-baht international arrivals fee has also been folded into the system. Neither is complicated but neither is optional.
Cash matters more than you'd expect on Phangan and Tao. Card payments are common but not universal, and ATMs can run dry around the Full Moon Party.
The rainy season in the Gulf of Thailand runs roughly October to December, which is the opposite of the Andaman side (Phuket, Krabi). If you're choosing dates and your trip is flexible, January through April is the safest bet for sun, with February probably the best single month.
And finally: the trio gets sold as interchangeable Thai islands and they really aren't. Pick the one that matches what you actually want from the trip rather than ticking off all three for completeness. The best version of this holiday is usually the one where you stay somewhere long enough to stop unpacking.