Hi Don
We visit St Louis fairly frequently and our pick is
Sundermeier. It is actually in St Charles just outside of St Louis. Everything you would want to do in St Louis is not far (maybe 15 minutes). You will love the old down town area of St Charles almost walking distance from the park. In KC I have a favorite on the east side
Worlds of Fun Village. On the west side in Topeka KS is
Deer Creek Valley. KC MO or KC KS are not exactly hot spots for great RV parks. WOF Village is maybe 15 minutes to Royals/Chiefs or Plaza. I know it's a park attached to a theme park but it's a great park even if you are not using the theme park. The park in Topeka is about 60 miles west of KC right off I70. Touring the capitol would be worthwhile. These picks are based on my preference for long level concrete sites and full hook ups. They are all easy to get to and safe, the one in Topeka is gated. Have fun!