Splash Island Family Waterpark
✓ Last confirmed for the 2026 season
Where: 651 Vestal Rd., Plainfield, Indiana
When: Late May through early September
Hours: Varies; check Plainfield Parks schedule
Cost: free
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Plainfield's outdoor waterpark steps up from splash pad to full aquatic center, with zero-depth entry, interactive spray structures and slides behind a paid gate. It is the west side's main upgrade option when a free pad no longer cuts it.