The sea around Koh Samui is more than beaches and sunsets. It holds dozens of uninhabited islets, mangrove channels, sea caves, and one of Thailand's most beautiful national marine parks — Ang Thong. Boat tours and kayaking reveal what remains invisible from the shore.

Ang Thong National Marine Park

Ang Thong is an archipelago of 42 islands 35 km northwest of Samui and the island's main offshore excursion destination. Day trips depart from piers near Nathon and Bophut early in the morning and return by evening. A typical program includes:

  • Snorkeling at shallow reef sites;
  • Kayaking through a sea cave and into the "Emerald Lake" (Talay Nai) inside the island — the tour's most memorable highlight;
  • A hike to a viewpoint overlooking the entire archipelago;
  • Lunch on board or on the beach.

The park closes in November–December due to stormy weather. For the rest of the year it's open, with peak season running January through May.

Day Trip to Koh Tao

Koh Tao — the gulf's premier dive island — lies 75 km north of Samui. High-speed ferries operated by Lomprayah and Songserm cover the distance in 1.5–2 hours. A day trip allows you to combine diving or snorkeling at Koh Nang Yuan reefs, lunch in the village, and an evening return. Staying overnight is also easy — Koh Tao has ample accommodation.

Sunset Cruises

Sunset catamaran and sailing trips are popular for couples and small groups. Samui's west coast — Nathon, Taling Ngam, Lipa Noi — faces west, and sunsets here are especially striking. Short 2–3 hour cruises with drinks and fruit depart roughly two hours before sunset from the port areas.

Yacht and Boat Charters

For those who prefer to plan their own itinerary, yachts and motorboats are available for private charter. A small longtail boat (traditional Thai vessel) can reach the small islands off Chaweng and Lamai in 15–20 minutes. Half-day or full-day charters are available depending on vessel type and season.

Kayaking Along Samui's Shore

Kayaking doesn't require a long trip: the northern coast (Maenam, Bophut) has mangrove patches suitable for independent exploration. Kayak rentals run 150–300 baht per hour at most beachfront spots. Morning is the best time: the sea is calmer and the heat hasn't built up yet.

Those who prefer a more structured experience can join guided kayak tours — these include a safety briefing, a route through mangrove channels, a snorkeling stop, and an on-board guide. Such tours are particularly popular in the Ban Taling Ngam area on the west coast.

Fishing Trips

Fishing excursions are another way to spend time on the water. Boats head offshore for several hours; catches vary — barracuda, tuna, and snapper are common. Some operators offer to prepare the catch on board. Suitable for experienced anglers and first-timers alike.