Splash Island might be Plainfield’s crowning achievement. Sitting on 4.3 acres, this waterpark is one of the largest of its type in Central Indiana, and it has three thrilling waterslides, a lazy river and a couple of water features. Splash Island will be open every day until September 4th. Like Greenwood’s Freedom Springs, Plainfield residents enjoy a small discount when attending this waterpark. Otherwise, admission is $11.00 for adults and $10.00 for kids between the ages of five and 17. Admission for children between the ages of two and four is just $8.00.