Located in Briscoe County, TX, this park is over 15,000 acres and the third largest state park in Texas. There is hiking, biking, and an equestrian rail trail extending through three counties. The canyons and ridges, carved out by erosion, are beautiful. The area is home to sheep, deer, coyotes, opossums, raccoons, bobcats, foxes, porcupines, prairie dogs, over 175 various birds, golden eagles, numerous snakes and lizards. The animal that stands out is the plains bison herd. There is also Lake Theo here, which has bass, catfish and rainbow trout. Temperatures average from 19F to 91F. There are cabins for rent and camping sites. Great staff and clean bathrooms. It was very windy and hot in May. Advisories were to have plenty of water on hand at all times. We stopped here on our way back from a trip and wished we could have camped there after seeing the area. They were all booked, so we just napped in hammocks by the water. We awoke to the awesome sight of bison coming down to the lake to drink. It does not get any better than this park.