Isolated from Thailand’s mainland by massive limestone cliffs, Railay’s coastline can only be reached via the Andaman Sea. But for visitors willing to make the trip, a brief long-tail boat ride from nearby Ao Nang will reveal thick mangrove forests, turquoise waters and white sand beaches perfect for lounging in the sun. For exclusive resorts and some of the best swimming on the peninsula, venture to Railay West Beach or Phra Nang Beach. Meanwhile, affordable accommodations abound at Tonsai Beach, a rock climber’s paradise, and Railay East Beach, the best place on the island to watch the sunrise.