The showers are great. Camp sites are well maintained. Fire rings, grills and picnic tables on sites. Sewer hookups on RV sites and nice tent camping sites. Store has what you will need and it's on the best part of river for floating. Security at gate keeps the riff raff from cruising the grounds.
There is nothing more definitively defining "Oklahoma" as floating the Illinois river in summer. We always base our camp in Peyton's Place. Off Highway 10, the camp spots are decently spaced out with a table and fire ring. It does get loud in the summer as many family's and groups use this spot to camp and float. The bathrooms are nice and the grounds have a volleyball court to start a pickup game. The main draw is the float trip. You can choose the 12 or 6 mile float. Check the water levels before you head out as it can be very low or very high depending on your time of year. The sites are shaded so after a long day on the river you can get out of the sun. Caution: it can get very very hot in the summer and we have seen a few snakes.