When Treasure Island Resort, Bay of Dreams Indoor Water Park and Family Land Outdoor Water Park merged with Mt. Olympus, they created a mega amusement and water park. Innovative roller coasters include Hades—the world's longest underground roller coaster. The ride takes visitors under Mt. Olympus' parking lot. Open May-September from 10 am. US$25 adults. Off Highway 12, Wisconsin Dells. Phone 608-254-2490. http://www.mtolympusthemepark.com.
