Up to Hurrah Pass, down into Jackson Hole, climb Jacob's Ladder, and then down Amasa Back.
Note: This is, theoretically, the route the Moab XC race was taken over on Sunday the 21st. Ouch.
21.55 miles, lots of dirt road, some great singletrack going into the hole, and some crazy fun bumpy downhill on Amasa Back. Total of 4160 ft of climbing, including the portage up Jacob's Ladder (e.g. NOT riding). Starting elevation around 4000ft, cresting about 4700 ft.
Short break at the bottom of the Ladder, and long break at the top. Watch out for the reverse sawtooth rock-plate hits going down the singletrack into the Hole, it's a high-speed area and super easy to pinch-flat there.