Heading up the canyon, you really don't start having ahuge amount of fun until the dos bitches, those two short steep climbs. They are doable, just commit to your line and you'll be over them post-haste. After this, you continue on to a dead end. Take the beginners to the right for fire road runs back to the canyon floor. Everyone else go left and head out to the small graded overlook area. Turn around and you'll see a sneaky little piece of singletrack heaven that cuts down the hill, avoiding the short fire road cruise out. It is fast, and usually rutted all to hell, but way more fun than the alternative. Head out and down the fire road for a boring return to the car, or turn around, retrace your route, and bomb back down sulphur springs the way you came in. Before you get out if the park completely (from either side), check the short climb up to the central ridge and run that little 2 mile singletrack exit to the horseshoe back to the car.