This is the beach from the Leonardo DiCaprio movie "The Beach." It's awesome! The only downside is that hundred of tourists come to visit this idyllic place in the high season. If you really want to enjoy it, your best bet is to spend the night at the one campsite on the island.
Tanote bay is east of ls Island. is a true paradise that will leave you with unique and typically tropical images. Its calm beach isn´t very visited, there are places to stay but its never very full. It´s one of the nicest corners on the island.
Bang Bao Bay is situated in the southwest of the paradise-like Koh Kut island. It's a tiny bay for enjoying nature, the ocean, and amazing sunsets. I'd suggest spending time in the two coves called Natural Beach and Siam Beach. The length of the bay is only 700 meters and it has some basic wooden bungalows with porches so you can enjoy the wonders of the Gulf of Thailand.
Natural Beach Resort or Koh Kut Resort are 2 of the places with the best prices and the best views of the gulf. You can also go kayaking and discover remote corners of the island, or strap on your goggles and snorkel and have a swim. You can get to Bang Bao Bay directly on the ferry from Trat. While it's not that big, it is a place to really lose yourself among the wild beaches and jungles. If you've ever dreamed of secluded beaches full of coconut and palm trees in front of a bright blue sea, this is your place!
The island of Koh Phayam is a fairly small and quiet island off the west coast of Thailand. It's known for its bays ranging from large and busy ones like Aow Yai to smaller and more isolated ones. Among the latter, perhaps the least accessible (you have to climb a small hill) is the Bay (Aow in Thai) Kwang PEEB. A resort with a few bungalows and a restaurant are the only buildings present and their very well-integrated and camouflaged in the lush vegetation leading down to the beach. The peacefulness of the bay and that fact that you'll often find yourself completely alone there, really makes you feel like you're on some tropical paradise. Swimming, sunbathing, snorkeling, and watching the geckos dart across the rocks are really all you can do, but hey, what else do you need?