Boulder Beach at Silverwood Theme Park Silverwood's Boulder Beach has everything waterpark-goers could ever want, aside from a real beach. Hop on the 650-foot rafting slide, wade through two huge wave pools, float down the lazy river, and don't forget the high-speed water slide; it'll have you flying at 55 miles per hour. Open June-Sept. $23.99-$46.99. 27843 Highway 95 Athol, Idaho • 208-683-3400 • silverwoodthemepark.com
Raptor Reef at Triple Play Family Fun Park This 25,000-square-foot indoor facility includes a large wave pool with up to 3-foot waves, an indoor/outdoor jacuzzi, a two-story play structure with slides and water guns, and three slides. $11.95-$21.95. 175 W. Orchard Ave. Hayden Lake, Idaho • 208-762-7529 • 3play.com/raptor-reef
Silver Rapids Indoor Waterpark at Silver Mountain Silver Rapids is Idaho's largest indoor waterpark, but you have to be a guest at the resort's Morning Star Lodge to use it. Book a room and you're free to surf in the 35-mph wave pool, float around the park in the lazy river, take the kiddos to the multilevel play structure and zoom down two inner-tube slides. 610 Bunker Ave. Kellogg, Idaho • 208-784-1930 • silvermt.com/Silver-Rapids-Indoor-Waterpark
Splash Down Waterpark Spend a day at Splash Down in the Valley and you can free-fall down a six-story waterslide, spin around the Cannon Bowl (Washington's first high-velocity bowl ride), enjoy four 400-foot slides, and join in a game of Waterwars, complete with water balloon launchers. Open Mid-June through Labor Day. $12.99-$16.99. 11127 E. Mission Ave. Spokane Valley, Wash. • 924-3079 • splashdownwaterpark.net
