Hey man, I usually just ride the Cutchenmine Trail. It is a 5 mile out and back. That particular trail is comparable to the Family Trail @ Mone Sano, although it does have a few good climbs. Tom Bevill trail is pretty technical, for me anyway. I found myself carrying my bike quite a bit. It is a longer loop on top of Ellenburg Mountain.
The owner if Guntersville Outfitters was able to get some of the hiking trails changed to multi-use. From my understanding, all trails to the left of the park entrance are hiking/biking, as well as the Golf Course trail (haven't been on this one yet). They do trail work the first Sunday of every month. I have been trying to get out for that but something always comes up.
Here is map:
http://www.briartech.com/gunt1page.pdf