It's about three and a half hours from DFW. Mapquest Talimena State Park in Oklahoma, but don't follow Mapquest's directions. Go 75 to Stringtown (7 miles north of Atoka), take 43 west 40 miles to Sardis Lake; take Highway 2 across the dam, then left 7 miles to Highway 1; take Highway 1 right to Talihina, Oklahoma, then go left at the light in town, Highway 271, then go 7 miles to the state park, spelled "Talimena." If you go Mapquest's way through Antlers, it adds about half an hour to the drive. There are some deep spots in the creeks where you could swim, but you'd have to ride to them.