One of the genuine superpowers of living in Koh Samui is the cluster of islands within an easy boat ride — Ang Thong National Marine Park, Koh Phangan, Koh Tao, and a string of smaller day-trip islands that would be world-famous destinations on their own if they weren't surrounded by each other. For long-term renters, these trips are the Samui equivalent of a weekend road trip: a change of scene that's genuinely reachable in a single day, and repeatable enough that you can visit different islands across the seasons.
This guide covers the day-trip islands actually worth your time, with real pricing, the best windows to go, and an honest take on which ones deserve repeat visits and which are one-and-done.
Ang Thong National Marine Park
The crown jewel of Gulf island excursions and the one most long-term residents end up recommending to every visiting friend. Ang Thong is an archipelago of 42 islands featuring dramatic limestone cliffs, hidden lagoons, coral reefs, and a few beaches that look pulled from a film set. The famous Emerald Lake (Thale Nai) sits inside a collapsed cave on Mae Koh island — the short climb to the viewpoint gives one of the most photographed views in southern Thailand.
Departing from: Nathon Pier (west coast) or Bangrak Pier, on speedboat or big-boat tours. Duration: Full day, roughly 8:30am to 5:30pm. Typical price: THB 1,500–2,500 per adult for speedboat tours with lunch, park fees, and snorkelling gear included. Big-boat tours run slightly cheaper but take longer. Best season: February through September. The park officially closes during the roughest weather (typically November through early January).
A day in Ang Thong usually includes two or three island stops, a kayak session through the lagoons, and a snorkelling stop over shallow reef. Go early in the low season to avoid the cruise-ship-style queues at the viewpoint. This is a trip worth doing at least twice — once at the start of your stay, once in a different season to see the light change.
Koh Phangan
Best known internationally for its Full Moon Party, but Phangan is a much more interesting island than that reputation suggests. The north coast has some of the best beaches in the Gulf — Bottle Beach, Thong Nai Pan Yai, and Thong Nai Pan Noi are genuinely world-class. The interior is lush jungle with a thriving yoga, wellness, and organic-cafe scene around Sri Thanu on the west coast.
Departing from: Bangrak Pier, Big Buddha Pier, or Nathon Pier depending on ferry operator. Duration: 30–45 minutes by ferry (Lomprayah or Seatran). Typical price: THB 300–600 per person one way; THB 600–1,200 round trip. Best for day trips: any time of year, though the north coast is more reachable in calm-sea season (March–October).
For a day trip, rent a motorbike at the pier (THB 250–400 per day) and plan your route inland. Thong Nai Pan is roughly 45 minutes from the main pier; Bottle Beach needs either a boat transfer from Chaloklum or a challenging jungle hike. Avoid Haad Rin during Full Moon periods unless that's specifically why you're going.
Phangan is the day trip long-term Samui residents take most often. The 45-minute ferry makes it a true day-out rather than an event, and the difference in atmosphere between the two islands is bigger than the distance suggests.
Koh Tao
The diving capital of Thailand and one of the best entry points to recreational scuba anywhere in Southeast Asia. Even without diving, Koh Tao is worth the trip — the snorkelling is exceptional, and the coral and fish density around Japanese Garden, Shark Bay, and Mango Bay is a step above what Samui's own coastline offers.
Departing from: Bangrak or Mae Nam Pier on fast catamaran. Duration: 1.5–2 hours each way by fast ferry (Lomprayah is the usual operator). Typical price: THB 800–1,200 per person one way; THB 1,500–2,200 round trip. Best season: March through October. December–February can see rough seas cancel crossings at short notice.
Koh Tao works as a day trip in the sense that the ferry schedule permits it — but many visitors regret not staying one or two nights. The island is quiet, the food scene is excellent, and diving schedules typically need at least a full day on the ground. If you're specifically going to dive, book an overnight stay rather than trying to fit it into a single day round trip from Samui.
Koh Nang Yuan
Attached to Koh Tao by a joint snorkelling-and-viewpoint visit, Koh Nang Yuan is the three small islets connected by a sandbar that's on every Thailand travel poster. The viewpoint climb takes 15 minutes and gives you the iconic shot looking down the length of the sandbar. Access is restricted to daylight hours and there's a THB 100–200 island entry fee, typically not included in ferry tickets from Samui.
Most day-trip packages to Koh Tao include a snorkelling stop at Koh Nang Yuan or at the reef directly beside it. If you're booking independently, make sure your itinerary includes Nang Yuan explicitly — some cheaper packages skip it.
Koh Madsum (Pig Island)
A charming little island just south of Samui, famous for its resident pigs who roam the beach and swim in the shallows. It's a genuinely fun half-day trip, particularly for families with children, and the beach itself is beautiful and uncrowded.
Departing from: Thong Krut Pier on the south coast of Samui. Duration: 20 minutes each way by speedboat; most tours combine it with a snorkelling stop at Koh Tan. Typical price: THB 800–1,500 per adult for a half-day trip including transfers and snorkelling. Best season: Year-round, though the south coast is slightly calmer in low-wind months.
The pigs are the draw, but the Koh Tan combination is what makes it a worthwhile trip — Koh Tan's coral reef is one of the healthiest around Samui and is less crowded than the larger-island equivalents.
Five Islands (Koh Haa)
A group of small islands off Samui's north coast, often overlooked in favour of Ang Thong but genuinely worth the trip. The coral here is healthy and colourful, waters are usually calm, and visitor numbers are a fraction of Ang Thong's. Good for a relaxed snorkelling afternoon rather than a full-day expedition.
Departing from: Bophut or Mae Nam Pier. Duration: Half-day, usually 4–5 hours. Typical price: THB 1,000–1,800 per adult. Best for: Long-term residents who've already done the big-name trips and want something quieter, or first-timers with a half-day to spare.
Koh Tan
Often combined with Koh Madsum on half-day tours from the south coast. Koh Tan is famous for its mangrove-lined shoreline, healthy reef, and the fact that it's almost entirely undeveloped. A good stop for snorkellers and paddleboarders, and a reminder of what the Gulf islands looked like 30 years ago.
Planning Your Day Trip
Best Time of Year
The Gulf of Thailand is calmest from February through September. Ang Thong National Park officially closes during the roughest period (usually November into early January), and Koh Tao crossings can be cancelled on short notice in December–February. For the fullest range of trip options, plan boat days between March and October. See also our guide on the best times of year to secure a long-term rental — the same wind patterns that drive rental pricing also drive the feasibility of boat trips.
How to Book
Three channels work:
- Through your accommodation. Most long-term landlords can recommend vetted operators with proper insurance and modern boats. At Park Samui we keep a short list of operators we've used ourselves.
- Direct with established operators. Lomprayah and Seatran run the main ferry routes to Phangan and Tao; Blue Stars, 747 Tours, and Island Tours are common speedboat operators for Ang Thong.
- Walk-in at a pier or tour shop. Cheapest route if you're flexible on date and willing to compare. Quality varies more than with booked operators — check the boat itself before paying.
Avoid the cheapest possible tour by a wide margin. A THB 800 Ang Thong trip on an overloaded longtail is not the same experience as a THB 1,800 tour on a modern speedboat.
What to Bring
- Reef-safe sunscreen — regular chemical sunscreen is now banned inside Thai marine parks
- Your own snorkel and mask if you have them; rental gear is rarely well-fitted
- Waterproof dry bag for phone, wallet, and spare clothes
- Cash for island entry fees (typically THB 100–300 per park) and drinks on the boat
- Motion sickness tablets if you're prone — take them 30 minutes before departure
Seasickness
The Gulf of Thailand is generally calmer than the Andaman side, but conditions vary. Seasickness tablets (Dramamine, Kwells) taken 30 minutes before boarding are effective and worth having on hand even if you normally tolerate boats well. Sit toward the middle of the boat rather than the bow for the smoothest ride.
Our Take
For long-term renters, the sequence that works best is:
- Ang Thong Marine Park in your first month — it's the one trip non-negotiable, and seeing it early sets the baseline for everything else.
- Koh Phangan as a repeat day trip throughout your stay — the beaches and the food scene are worth returning to.
- Koh Madsum with family or visiting friends — fun, easy, half a day.
- Koh Tao as an overnight trip, not a day trip — book two nights and actually enjoy it.
- Five Islands or Koh Tan later in your stay, when you want something quieter than the big-name trips.
One of the genuine advantages of long-term rental in Koh Samui is being able to pick your day-trip weather rather than having it pick you. If you're still weighing where to base yourself, our Samui house rental guide covers how the residential areas compare for daily life — the same factors (proximity to a calm pier, a quiet street, an easy ride to Bangrak) tend to matter for day-trip access. If you're planning your stay, see our pricing and availability, the Superior Town House, the Deluxe Town House, or the neighbourhoods guide to help decide where to base yourself for easy pier access.