Indoor Water Parks..

Wilderness Territory Waterpark Resort

No matter how cold it gets outside, you'll always find temperatures in the 80s in these indoor water parks, where you can do everything from surfing 35-mph waves to riding a lazy river. Text by Laura Kiniry, Budget Travel.

Indoor Water Parks: Splash Lagoon

he first water park in the U.S. opened in 1989, and 13 years later Pennsylvania finally caught onto the trend with Splash Lagoon in Erie, Pa. It may have taken a while, but as this park proves — some things are worth waiting for. The park attracts about 400,000 annual visitors and will open a new 30,000-square-foot wave pool this summer.

Indoor Water Parks: Avalanche Bay Indoor Waterpark

In Michigan's northwestern region, Boyne is best known as a ski escape. But the area is also home to the 88,000-square-foot Avalanche Bay, where skiers often thaw out in the 84-degree temperatures. The park is home to Michigan's only surf simulator, the Rip Zone, where guests can try either stand-up surfing or boogie boarding.

Indoor Water Parks: Kalahari Resort

The African-themed Kalahari in Sandusky, Ohio, is an expansive 173,000 square feet (it's the largest water park under one roof in the U.S.) and features a spectrum of thrill rides, from the 55-foot-tall Cheetah Race waterslide to the speedy, 400-foot-long Rippling Rhino tube ride.