The indoor waterpark, which will span 100,000 square feet, will offer family-friendly attractions such as a wave pool, lazy river, and numerous water slides. Image Provided By: OKANA Resort ...

Great Wolf Lodge: Multiple Locations Nobody does indoor water park resorts like Great Wolf Lodge, which offers nearly two dozen locations across the U.S. (plus one in Canada).

The 300,000 square-foot development will include a 275-room Marriott hotel, 50,000 square-foot indoor water park and 50,000 square-foot Hollywood-themed experience—or “edutainment” center.