A full map of the area is available here:
LINK
If you re-read the post, that map was only to show another camp- BMRA has over 45 trails for full-size OHV's. Check the map, or the website, or better yet go there and learn your way around.
Last January's Lone Star Toyota Jamboree included a timed run through Twister....
Some of the most challenging:
Scorpion's Pass (5)
Dewoody (5)
Chaos Canyon (4)
Shake, Rattle & Roll (4)
Houston Creek (4)
Jerry Paul's Expressway (4)
Venom Loop (4)
Weenie World (4)