I WANNA GO! Grand Wailea Canyon Activity Pool Maui, Hawaii 25,700-square-ft wet playground's a destination in itself (guests receive a map upon entry). 9 pools at 6 levels (40 ft to sea level) connected by a river that carries swimmers along at varying speeds, lazy river currents to whitewater rapids. Highlights include 7 slides, grottoes, scuba certification pool, & Tarzan pool w/ rope swing. The world’s only water elevator swimmers are lifted to the surface in a sealed chamber.