Top-notch surfing, sailing, snorkeling, kayaking and mountain biking make Poipu, on the southern side of Kauai, a magnet for sun-loving adventurers. The Koloa Heritage Trail, accessible by foot or car, traverses five million years of history in a 10-mile stretch. More sedentary types can take in the breathtaking valleys of the Garden Isle via a helicopter tour or spend a languid evening basking in Hawaiian rhythms at a local luau. And of course, there's always the golden-sand beach, ranked among the best in the nation.