Summer fun in Winter @ Great Wolf Lodge, Wisconsin Dells.

Great Wolf Lodge is an indoor water park resort in Wisconsin Dells, Wisconsin. It's located in the Waterpark Capital of the World, and is the flagship property of Great Wolf Resorts.
The resort offers many activities and entertainment for kids, including:
MagiQuest, a live-action kids' adventure game in a separate building
Kids activities
Slides
Great entertainment
The resort is kid-friendly, with friendly lifeguards, nice condos, and great programs for kids. Others say it's fun and clean, with friendly people. The resort also has a seasonal outdoor pool and barbecue.