A jungle island 30km east of Bangkok with waterfalls, beaches, diving, and a more laid-back vibe.
Beaches on the eastern side, waterfalls inland, diving/snorkeling shops, simple bungalows and upscale resorts mixed together.
Direct van from Bangkok (3–4 hours, 300–400 THB) to the pier, then speedboat to island (45 min, 200 THB); or overnight stay.
Swim, snorkel, dive, hike to waterfalls, eat fresh seafood, relax — less touristy than Phuket/Pattaya.
Weekend escape, beach day, light adventure; less crowded than popular southern islands but still accessible from Bangkok.
Go Wed–Thu (weekday) if you want fewer tourists; Friday–Sunday gets busy with Bangkok weekenders.
Given the 3–4 hour travel time each way, an overnight stay makes far more sense than a single day — budget bungalows start around 500 THB, making even one night an easy add.
November to April is dry season with calm seas for swimming and diving; the island quiets down considerably during the May–October rains, when some beach resorts close entirely.
A rented scooter is the standard way to explore beyond the beach nearest your accommodation, though songthaews (shared pickup trucks) cover the main routes for those who'd rather not drive.