Ko Samui

Forty-two limestone islets rise like jade sentinels from an emerald sea, their sheer cliffs honeycombed with sea caves and hidden lagoons—Ang Thong is the Gulf of Thailand’s geological masterpiece. The park’s crown jewel, Ko Mae Ko, cradles the inland saltwater lake Talay Nai (Emerald Lake), reached via a steep stairway that rewards climbers with a panorama so surreal it graced the screen in “The Beach.” Kayaking through the archipelago’s turquoise channels reveals secret beaches accessible only at low tide, while snorkeling sites like Ko Wua Talap teem with parrotfish, blue-spotted rays, and the occasional blacktip reef shark. Above water, hornbills swoop between fig trees and dusky langurs leap across the canopy. Despite its cinematic fame, Ang Thong retains a primordial hush; overnight stays are banned, so the islands revert to nature each dusk, leaving day-trippers with the lingering taste of salt and wonder.