Centennial Park in Davenport has a playground and splash pad. We stopped here after hiking at Wildcat Den on a very hot day and my kids were anxious to splash. Unfortunately, it was difficult for them to change into swimsuits because homeless have moved into the restrooms.
The riverfront area of the park was beautiful, the playground was in pretty good condition and the splash pad was great with two separate areas. One of which was great for little kids to splash.