There's enough riding here to last a lifetime. The entire reservation is surrounded by gravel fire roads and is interconnected all the way through with literally a hundred or more single track routes. Each route has its own number (make sure to check out and take a map at the beginning so you don't get lost, which is easy!) and vary from muddy swamp rides to boulder-infested hill climbs to crazy paths filled with logs, rocks, hills, trees, large animals, and more! If you follow the signs to Dungeon Road leading to Dungeon Rock, you'll also be treated to some awesome hiking, which is a nice way to take a break. Strongly recommended! This place has everything.
Lynn MA
http://www.singletracks.com/item.php?c=1&i=1379