This trail throws everything at you. Though it's not long, your skills will be fully tested.
Lots of variations here. Service roads will take you to the top of the mountain, and then there are a multitude of singletrack descents available. There is some easy stuff, but for the most part, the singletrack is pretty technical stuff, with roots, big rocks, sheer drop offs, tight switchbacks, etc. This ride is a test of climbing, descending, and technical work.
How to get there:
Take County road 38E West of Fort Collins, around Horsetoon Resevoir, and you'll come to the park entrance a few miles back on your right.
Admission is $6.00 for the day, well worth it considering the quality and quantity of the trails.