This gentle lazy river passes through the water park’s landscape and into the volcano’s hidden caves. The highlight of the ride is Stargazer Cavern, a mist-filled grotto with constellations of pinpoint lights blanketing the rocky ceiling. Beware of spots where guests on dry land can soak you by triggering TapuTapu-activated fountains. You’re allowed to swim along without an inner tube, but snag one anyway for maximum relaxation.