Ang Thong National Marine Park is the showpiece day trip from Koh Samui — an archipelago of 42 limestone islands scattered across the Gulf, famous for the hidden Emerald Lake (Talay Nai), dramatic viewpoints, sea kayaking and snorkelling. The park inspired the setting of the novel The Beach, and a day among its towering karsts and turquoise water is the standout natural experience of a Samui holiday. As a Thailand DMC for travel agents, Explera books the cruise or speedboat, kayaking and national-park formalities.
What makes Ang Thong special?
- The Emerald Lake — a hidden saltwater lagoon (Talay Nai) glowing jade-green inside a collapsed karst, reached by a short climb on Koh Mae Ko.
- The viewpoint climb — a steep but short hike to a panorama over the whole archipelago, one of Thailand's iconic views.
- Sea kayaking — paddling among the limestone islands and caves is a highlight of the day.
- Snorkelling & beaches — clear water, reefs and quiet beaches for swimming.
The day-trip format
- Big boat or speedboat — the slower big-boat cruise is relaxed and good value; the speedboat reaches more islands and is faster.
- Kayaking, snorkelling, viewpoint and lake — the day combines the key highlights with lunch on board or on a beach.
- National park fees — payable on top of the tour; we confirm current inclusions for clean quotes.
- Seasonality — the park can close during the roughest weather (often around November); we confirm operating dates.
How agents package it
- The Samui must-do — position it as the standout natural day for any Koh Samui stay; our Thailand DMC tours & activities team builds it.
- Boat to match the client — big boat for relaxed families and value; speedboat for active clients wanting more islands.
- Private charter — a private boat via our Thailand DMC boat charters suits VIPs and honeymooners.
- See the Koh Samui destination guide and full Thailand DMC services for travel agents; the trade desk tailors it.
Frequently asked questions
What is the Emerald Lake?
Talay Nai is a hidden jade-green saltwater lagoon enclosed by limestone cliffs on Koh Mae Ko, reached by a short uphill walk. It is the park's signature sight, viewed from above.
Big boat or speedboat — which should I sell?
The big boat is relaxed, good value and gentler on the sea; the speedboat is faster and reaches more islands. We advise based on your client's pace and budget.
Is the park open all year?
Ang Thong can close during the roughest weather (often around November on the Gulf coast). We confirm operating dates for your client's travel period.
Is it suitable for families?
Yes — kayaking, snorkelling and beaches suit families, though the viewpoint and Emerald Lake involve short, steep climbs that are optional.
