Unplug at secluded Banyan Tree Samui, a tranquil haven of bone-white beaches and cobalt waters overlooking Lamai Bay, on the southeastern coast of Koh Samui. Set in the side of a hill on a private cove, the resort is composed of Thai-style villas and sports stunning views of the Gulf of Thailand. There's not much to do here, so relax. That is the point, anyway. Enjoy the Rainforest Spa with its European-meets-Asian hydrotherapies, practice yoga, or explore the nearby village by bike.