With more than 30,000 square feet of swimming pools and water slides, and a renovation in 2022, Rapid City's WaTiki ® Indoor Waterpark Resort is the largest indoor water park in the Dakotas. Located just off Interstate 90 at Exit 61, WaTiki ® Indoor Waterpark Resort is just a short drive away from all of the Black Hills’ most memorable attractions. The resort is home to five hotels.