Devil's Sinkhole, 830 563 2342. Largest single-chamber cavern in the state. Reservations required.
Garner State Park, 234 R.R. 1050, in Concan, 830 232 6132. Beautiful park with cypress trees along the Frio River, great for innertubing. The park also hosts large dances at night which are a tradition since the 1930's.
The Hill Country River Region lies between the San Antonio area and Big Bend Country in south central Texas. It is an area of lush green canyons carved into the limestone hills by the Sabinal, Leona, Frio, Dry Frio, and Nueces Rivers.