Spent the spring here and really enjoyed the campsites in the middle loop along with the easy access to a decent hiking trail. Weekdays are awesome, but can get crowded on holiday weekends.
Kaw Lake dam is a short drive from the dam and can be an excellent striped bass or hybrid striped bass fishing area.
Osage cove also includes the southern trailhead for the Eagle View Trail: https://www.gaiagps.com/public/VXHJ0UtmoL15vy84TjbATjT0
Camped here in June and the canyon provided a nice break from the heat. Worth the stop.