Promoted as "China's Hawaii," the tropical island of Hainan is a favorite resort getaway for wealthy Chinese. Sailing into port city Sanya, you'll get a good idea of the island's contrasts. On one side is a raggedy fishing fleet; on the other are five modern skyscrapers sheathed in computerized lights. A causeway leads from the port into town, and you can hop a complimentary shuttle bus to reach the city center.