Kiener Plaza Splash Pad
✓ Last confirmed for the 2026 season
Where: 500 Chestnut St, St. Louis, Missouri
When: seasonal (summer)
Hours: 6 a.m.-10 p.m.
Cost: free
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Downtown's civic front lawn combines a splash area with a dry playground of swings and climbing nets, all framed by a postcard view of the Gateway Arch. It is a convenient add-on to any downtown outing with kids.