While this is the darling of Bangkok island lovers, with a selection of white sand beaches and a real Koh Phangan or Koh Tao vibe to it, you might want to save Samet for a weekday. It gets really packed on the weekends, not to mention that prices go up, but if you do come during the week, it really is an excellent spot. The oil spill here in 2015 did some major damage to the beautiful west coast beach of Ao Phrao, but the east coast beaches and water are unscathed. Activities range from mountain biking, heading down to the unspoiled southern tip of the island, where one can see some gorgeous sunsets. The best beach is Ao Phrao, on the west side, but it’s also the most expensive, full of upmarket resorts. The lower east side beaches are by far the most tranquil. To get here, take a bus or minivan from Bangkok to Ban Phe (2 hours), from where the ferries and other boat options to Samet run from.