The Spine - short, fun singletrack near Tuul River.

Nasty, steep climb with a huge payoff on the downhill just 15 min from UB.  There is one short, steep hiking section to get up on the ridge, but the rest is rideable.  The trail continues past the end point, but it's all big boulders and downed trees.

The descent is one of the best in the area - all singltrack, fast and seriously fun.  Heads up for the loose granite surface.  Not a nice place to fall - speaking from experience.  Have fun!