Jim & Brenda,
The Leakey/Concan area is a great place to explore, and should be really nice in mid-Sept. We haven't stayed at Garner in several years - it's a very popular family c/g during warm weather & sometimes difficult to get a site. If you need another option... directly across the river from (& on the bluff above) Garner S.P. is a commercial RV Park: Parkview Riverside RV
http://www.parkviewriversiderv.com/ Also "off the beaten path", with TACO & Good Sam discounts (PA-AM?), mature trees, river sites... and the "Frio" River is appropriately named
Brrrr!
Although some TX State Parks are still closed/restricted after the flooding, apparently no issues at Garner.
http://tpwd.texas.gov/state-parks/pa...k-alert-status
Enjoy & travel safely!
Terri, the Chevy co-pilot