Ko Tarutao

9 secret beaches in Southeast Asia you need to know about - SilverKris

"A protected national park island with virtually no development beyond a few park bungalows, tents and a single restaurant; accessible by a 45-minute speedboat from Koh Lipe. Historically used as a penal colony in the 1940s, it appeals to visitors seeking pristine, uncrowded beaches—most stay by the boat pier on Ao Pante, while those willing to travel the extra 8 km can find Ao Son, an empty white-sand beach backed by steamy jungle. Wildlife is abundant, with sightings commonly including langurs, hornbills, crab-eating macaques and a wide array of birds and butterflies." - SilverKris