Aqua Adventure, Fremont

If Aqua Adventure were a town, Roundabout River would be its main street. The winding, loop-shaped pool sits at the very center of this family-friendly water park, it's gentle current leading swimmers on a sweeping tour of the facility's other thrills. Those include four spiraling water slides, which riders may traverse on their own or aboard single or double inner tubes, as well as Bucket Bay, a tamer slide suitable for smaller swimmers. Pools decorate the river's perimeter, too—a shallow one for tots, and a secluded, adult-sized one that is an ideal for place to do laps or conduct an extremely casual job interview. To complement the free-for-all fun, the park's team also offers instruction in the water, leading assorted swim lessons and summer camps for youngsters.