Most pools are not designed for children, with their plunging deep ends, regular calls for "adult swim," and robust colonies of piranha. Not so at Swimtastic Swim School, where every aspect of the center's design caters to youthful aquanauts. After passing by the colorful front desk changing into their suits, kids rinse off in the warm water of the on-deck palm-tree shower. Once classes begin, swimmers dunk into the pool itself, ranging from 3.5 to 4.5 feet deep and heated to a constant, comfortable 90 degrees. In the lessons themselves, experienced instructors use the skills they learned in the center's 30-hour training course to lead small groups through the basics of water safety and proper swimming form. Regular open swims let kids show off their aquatic mastery to parents and friends and make unlimited use of the deep-end water slide.