Here are two links, probably better ones out there, there is a neat book called Hiking and Backpacking Trails of Texas by Mickey Little that has lots of info state wide or just the area you want. We got the book at Barnes & Nobel in the texas travel section
http://www.texashiking.com/Hiking/Hi...spx?HikeID=462
http://www.cedarbayou.com/cross_timbers.asp