Directions to the various trailheads/list of fees/restrictions/etc:
http://www.fs.fed.us/r8/texas/recreation/sam_houston/multi-use_trail.shtml

East side map:
http://www.fs.fed.us/r8/texas/maps/sam_mut_east_2007.pdf

West side map:
http://www.fs.fed.us/r8/texas/maps/sam_mut_w_nw_2007.pdf

Call before you haul numbers:
Local: 936-344-6205 (option 2)
Toll free: 888-361-6908 (option 2)

Saturday Ranger Station Hours
http://www.texasoffroad.net/images/shnftimes.jpg