Splash Lagoon Indoor Waterpark Resort is a large Polynesian-themed indoor water park located in Erie, Pennsylvania. The park is approximately 80,000 square feet. It features nine water slides, two hot tubs, one large activity pool, a five-story activity tree house play structure, a toddler play pool, a 30,000-square-foot wave pool, a FlowRider, and a 6,500-square-foot arcade.