The Wilderness Territory Waterpark Resort near Wisconsin Dells, Wisconsin, is one of the largest indoor water parks in the United States, spreading out over 600 acres. The Avalanche Bay Indoor Water Park in Boyne Falls, Michigan, has a surf simulator, the Rip Zone, that lets guests try their balance at surfing or boogie boarding. Both parks are only available to resort guests.
The Kalahari Resort in Sandusky, Ohio, has a selection of African-themed water slides and thrill rides. It is famous for the Zip Coaster, which takes riders through 500 feet of drops and turns in only 30 seconds.
Splash Lagoon in Erie, Pennsylvania, is affiliated with four different hotels, giving families a range of lodging options for their water-park vacations. The 102,000-square-foot park has a good selection of water rides as well, and the tropical theme provides a nice escape from the area's cold winters.
Splash Resort in Panama City, Florida, is right next to the beach and only a short drive from Shipwreck Island Water Park, but the condo resort also features an indoor park for its winter guests. Children can enjoy water slides and a dive-in movie theater while parents enjoy the fitness center or the Jacuzzi.