Say "Sawasdee" to paradise in Hat Phra Nang, a beach accessible only by boat along the Andaman Sea in Railay, Thailand. Rent a sea kayak and explore caves and lush lagoons hidden in the many sandstone karst formations located off the shore, like Happy Island, seen here. Take rock-climbing lessons. Or pack a picnic lunch and have a long-tail boat driver deposit you on a nearby isolated islet for the day. Just remember not to pay until after the boat returns to take you back to the mainland!