I've only taken my TJ to Huffines in Lewisville, and it wasn't the best experience. Unless you get someone who understands the passion of the Jeep owner, the experience is going to be less then stellar.
Legal wheeling, with easier trails, head out to Gilmer to the Barnwell Mountain Recreation Area. Barnwell Mountain Recreation Area
They have a mix of stuff, but its been a few years since I've been out there. I can't think of any legal areas around DFW, maybe tolerated, but not legal.