Aquaport
✓ Last confirmed for the 2026 season
Where: Aquaport, Maryland Heights, Missouri
When: seasonal (summer)
Hours: typically daylight hours
Cost: $7
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Maryland Heights' municipal water park offers a FlowRider surf simulator, lazy river, flume slides, and a Cardinals-themed kids area at small-city prices ($7 resident adults, kids 3 and under free). Nonresident admission roughly triples the rate.