We visited here June 2012. It was a beautiful park with full hook-up sites. The camping loop was a bit different but we loved how it was open in the middle for all the kids to play together. We had a nice campfire at night while the kids played manhunt in the open field area between the sites.
This park has hiking, biking and boating although we didn't do any of that because our purpose there was to visit the St. Louis Arch ( about 1 hour away). This was the closest State Park we could find on that trip.