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.

Four distinct parks make up Wilderness Territory Waterpark Resort in Wisconsin Dells. This massive 600-acre resort stays a balmy 88 degrees regardless of the temperature outside. It may take several seasons to experience all of the rides here, but the park's tour de force is the Hurricane — a family raft ride that drops 58 feet then spins into a funnel that mimics a hurricane in enough detail (lightning and fog machine alert!) to be as terrifying as it is fun. 511 E. Adams St., Wisconsin Dells, Wis., 800/867-9453. Park access for resort guests only; doubles from $99. Short drive from Madison, Wis. (55 miles).