Hot Summer Fun! Coolest Water Park around!!! Food, Family, Friends, Kids, Events, Partys, and Summer Programs!!! The Splash House is a water park in Marion, Indiana. The park boasts having the highest surf-able wave in Indiana with the almost brand new wave pool. Other features of the park include slides, lazy river, kiddie area, and whirlpool. The Splash House employs over 90 employees every summer from lifeguards, concessions, to front desk.