For the grand finale of our day at Water World, my friend and I hauled our tubes up the winding cement path to the entrance of the Voyage to the Center of the Earth, aka the dinosaur ride. In the wading pool, where the tubes queue up, you can hear the roars of animatronic dinosaurs that await in the caverns. These days, the gravity-defying, high-tech water roller coasters and the Zoomerang (a supersized half pipe that you conquer in a tube) are the star attractions at Water World in Federal Heights.