20. Six Senses Ninh Van Bay, Vietnam
You’ll need to endure a long-haul flight and a car and boat transfer to get to this luxury boutique hotel. But once you’ve arrived at Six Senses Ninh Van Bay, it’s all about pampered relaxation. The 58 villas are set amid massive rock and boulder formations and overlook the South China Sea; those along the beachfront are extra luxurious, with paths running directly to the sand.