Now Open! New Lost Harbor Indoor Waterpark! 130 Rooms/Suites, Lost Lagoon Outdoor Water Activity, Outdoor Cabana Bar & Grill, Indoor Pool/Slides, Whirlpools, Houlihan's Restaurant & Bar, Sauna, Fitness Center, Game Room, Gift Shop. Discounted attraction tickets sold in lobby-summer season. Next to Tommy Bartlett Show. On Wisconsin Dells Parkway.