Holly's drops down from The Canyons bike park all the way down to the base of the resort. While at times it feels like a gravity trail, on the whole Holly's is just a fantastic descent, complete with high-speed sections, tech sections, kickers, lips, berms, switchbacks, and plenty of rocks. All told it doesn't have anything that requires a full-blown DH bike, but it is an incredible, rocking descent!
Park City, at the Canyons
http://www.singletracks.com/item.php?c=1&i=7534