Maui, Hawaii, United States
The beautifully designed, 780-room Grand Wailea is awe-inspiring in its scale: It's got the best pool in Hawaii, one of the top U.S. spas, and a prime location on one of the best U.S. beaches. It's hard even to call the 25,700-square-foot Wailea Canyon Activity Pool complex a "pool." It's more like an aquatic theme park, marked by an exciting water feature at every turn. There is a streaming lazy-river pool, five fun waterslides, whitewater rapids and caves, the world's only "water elevator" -- at the center of a multilevel volcano, you can sit on an inner tube that rises and descends with the water level (which is controlled by an operator), a rope swing, and a swim-up bar at the volcano. There is also a multilevel adults-only pool, two mosaic-tiled whirlpools, and a poolside bistro.