Things to Do in Koh Samui

Koh Samui sits on the Gulf of Thailand and follows a different weather pattern from Phuket and the Andaman coast. The best weather runs from January to August, with February to April being the driest and calmest months — ideal for diving, snorkelling, and boat trips to Ang Thong Marine Park.

The Gulf monsoon hits hardest in November, when heavy rain and rough seas can disrupt ferry services and beach days. December is transitional — often wet early in the month but clearing by Christmas. The upside of shoulder months (May, October) is significantly lower hotel prices and fewer crowds, with weather that's still mostly sunny.

A key advantage of Koh Samui's schedule: when Phuket and Krabi are in their monsoon (June–September), Koh Samui often has sunshine. This makes it the best Thai island for a summer beach holiday.

Chaweng Beach is the main event — a 7-kilometre sweep of white sand with every amenity imaginable. It's busy but earns its popularity. Chaweng Noi at the southern end is quieter and more upscale. Lamai Beach is the second-largest, more laid-back than Chaweng with a backpacker-to-mid-range vibe and excellent swimming.

For families, the north coast is the sweet spot. Choeng Mon has calm, shallow water and a village atmosphere. Maenam is quiet and local-feeling with affordable beachfront bungalows. Bophut's Fisherman's Village combines a decent beach with the island's best dining strip.

The hidden gems: Silver Beach (Crystal Bay) between Chaweng and Lamai is a tiny, photogenic cove — arrive early to claim a spot. Lipa Noi on the west coast has Koh Samui's best sunsets and almost no tourists. Taling Ngam in the southwest is remote, peaceful, and home to some of the island's most exclusive resorts.

Ang Thong Marine Park is Koh Samui's top day trip — a stunning archipelago of 42 islands with emerald lagoons, sea caves, and viewpoints. Full-day tours (฿1,400–1,800) depart from Na Thon pier and include snorkelling, kayaking, and a hike to the famous Blue Lagoon viewpoint. The park is closed in November and December.

Koh Phangan is just 30 minutes by speedboat — most visitors know it for the Full Moon Party at Haad Rin, but the island's quieter north and west coasts (Bottle Beach, Thong Nai Pan, Haad Salad) are beautiful day-trip destinations. Koh Tao is 1.5 hours further and offers some of the best (and cheapest) diving in Southeast Asia.

For something different, book a longtail boat to Koh Tan and Koh Mudsum — two tiny islands off the south coast with excellent snorkelling, no cars, and almost no other tourists. Half-day trips run ฿800–1,200 from the Taling Ngam pier.