Cabelas has lot's of good maps, but if you stop by any Forest Service building, they have free maps of Dixie Nat'l Forest (the national forest in southern Utah), and they have virtually all the trails on them. I live in Cedar City, and could get with you and show you some good trails on the Markagunt Plateau. There are a TON of trails there. That's where I ride, primarily, so I know them pretty well.