Best Islands in Thailand (2026): The Top 15 and How to Choose Yours

Thailand’s biggest island is also the simplest trip from India, because you land at Phuket airport (HKT) and skip ferries entirely. Old Town’s Sino-Portuguese shophouses, the late-night noise of Patong, and calmer sand at Kata and Nai Harn all sit within an hour’s drive of each other. Treat it as a base rather than the whole holiday: day boats run from here to Phi Phi, James Bond Island and the Similans. For a first Thailand trip with a mix of beach, food and one big night out, nothing else is this easy. Read our guides to places to visit in Phuket and Phuket nightlife to fill the days.

Maya Bay reopened and is open daily, roughly 7 am to 6 pm, with a short conservation rest usually across August and September. The national-park ticket is 400 THB (about Rs 1,150) for adults and 200 THB for children, and it covers Maya Bay, Pileh Lagoon and Bamboo Island on the same day. Phi Phi Don holds the bars and the sweaty Viewpoint climb; the uninhabited Phi Phi Leh holds the scenery you came for. Ferries from Phuket or Krabi take about 1.5 to 2 hours, so many people visit on a day trip rather than staying over.

Krabi is the mainland gateway with its own airport (KBV), and Railay is the climbing beach next door that you can only reach by longtail boat. Between them you get limestone walls, the cave shrine at Phra Nang beach, and easy hops to Phi Phi, Koh Lanta and the Hong Islands. It is the best-value Andaman base after Phuket, quieter and cheaper, and it suits couples and climbers who want scenery without a resort strip. Rock-climbing outfitters on Railay run half-day beginner sessions daily in season.

The Gulf’s polished resort island runs on the opposite calendar to the Andaman: driest from about December to August, with February to April the sweet spot, and wettest in October and November. Fly in through Bangkok to Samui (USM), or fly to Surat Thani and take the ferry across for a good deal less. Chaweng brings the buzz, Bophut’s Fisherman’s Village brings the slow dinners, and Lamai brings quieter sand. It is the default honeymoon pick because the resorts, spas and airport all sit on one island. See our guides to beaches in Koh Samui and Koh Samui nightlife.

This small Gulf island certifies more divers than almost anywhere on earth, and it is cheap by dive-school standards: an open-water certification course runs roughly THB 10,000 to 13,000 (about Rs 29,000 to 37,000), gear and boats included. The water stays diveable most of the year, with April to July the clearest. You reach it by ferry from Chumphon on the mainland or from Koh Samui and Koh Pha Ngan. Bungalows behind Sairee beach cost little, the snorkelling starts a few metres offshore, and the day trip out to Koh Nang Yuan is worth building in.

Two islands live inside one here. The south end, Haad Rin, throws the monthly Full Moon Party, thousands of people, buckets and body paint on the sand. The north and east coasts are the opposite: yoga retreats, wellness resorts and empty coves. If you want the party, check the full-moon date before you book flights, because it drives room prices. If you want the quiet, stay well away from Haad Rin. Ferries from Koh Samui take about 30 to 45 minutes.

Lanta is where Andaman families and slow travellers go. Long, flat, west-facing beaches line up one after another, each with a few sunset bars, and the road-plus-ferry trip from Krabi is short. It is also the jumping-off point for the Trang islands and the Emerald Cave. Quieter than Phi Phi and better suited to a week than a weekend, it rewards renting a scooter and drifting south to Bamboo Bay.

Down near the Malaysian border, inside Tarutao National Park, Koh Lipe has the clearest water on Thailand’s Andaman coast and three walkable beaches. Speedboats run from Pak Bara pier, and in high season you can arrive straight from Langkawi in Malaysia, which makes it easy to bolt onto a wider trip. It is small and romantic, better for couples than for a big group, and the Tarutao park fee (200 THB) applies on arrival.

When decision guides talk about the real Thailand, they usually mean these two. Sitting in the middle of Phang Nga Bay, halfway between Phuket and Krabi, Koh Yao Noi and its bigger sister Koh Yai are rural, Muslim fishing-village calm, ringed by rice paddies and rubber trees rather than bars. Rent a bicycle, kayak out among the limestone karsts, and eat where the boat crews eat. Ferries run from both Phuket (Bang Rong pier) and Krabi, so it slots neatly between the two.

The Similans are the country’s top dive and snorkel park, and they open for only half the year: 15 October to 15 May, then closed 15 May to 15 October 2026 for the monsoon. Powder-white sand, house-sized granite boulders and clear blue water make it a bucket-list dive. Entry is 500 THB (about Rs 1,430) for adults and 250 THB for children aged 3 to 14. You visit by day boat or on a liveaboard from Khao Lak or Phuket; there is no resort to stay in on the islands themselves.

Thailand’s second-biggest island sits in the eastern Gulf near the Cambodian border, and it is greener and wilder than the southern resorts. A ridge of rainforest runs down the middle, waterfalls tumble off it, and a string of beaches lines the west coast. It is family-friendly and less polished than Samui, which is part of the appeal. Reach it by flight or bus to Trat, then a short car ferry. Part of it is protected as Mu Koh Chang National Park (200 THB).

Farther out past Koh Chang and Koh Mak, Koh Kood (also spelt Koh Kut) is still mostly untouched: low-rise resorts, empty white beaches and almost no nightlife. It has some of the best resort sand in the country and next to nothing else, which is exactly the point. This is the honeymoon that trades buzz for silence. Getting there takes a ferry from Trat and a little patience, and that distance is what keeps it quiet.

If your Thailand trip is really a Bangkok trip with a beach tacked on, Koh Samet is the answer. It is the nearest good island to the capital, about 3 to 4 hours by road plus a 40-minute ferry from Ban Phe. The sand is white and squeaky, the weekend crowd is mostly Thai, and you can be back in Bangkok by dinner the next day. It sits inside a national park, so a 200 THB fee applies at the pier.

Koh Kradan keeps turning up on best-beach lists, and it earns it: a long, undeveloped strip of pale sand with a reef you can snorkel straight off the shore. It is one of the Trang islands, low on nightlife and high on quiet, usually paired with a trip to Koh Mook’s Emerald Cave next door. Ferries run from the Trang piers in season. This is a November-to-April island only; the monsoon shuts most of it down.

This protected cluster of 42 islands is the one that inspired the novel behind the film The Beach, and it makes a spectacular day trip from Koh Samui or Koh Pha Ngan. Kayak through the limestone lagoons, climb the short, steep trail to the Emerald Lake viewpoint, and snorkel between the karsts. February to April is the calmest window for the crossing. The park fee is 300 THB, and you visit on an organised boat rather than staying overnight.