Flatlanders will be sucking for air at this features-packed bike park, which tops out at 11,640 feet on Dercum Summit. But the pain will be worth the pure pleasure as Keystone offers a vertical drop of 2,360 feet, the longest in the United States (a top-to-bottom run can last up to 20 to 30 minutes).

This park has worked hard over the past few years to develop highly unusual features and an extensive range of new trails; it now features 57 trails in a 55-mile network. The East Forest Trail challenges advanced riders with an elevated, wooden 18-foot corkscrew dropline. The Drop Zone is a terrain-park-like area on the mountain featuring ramps, rock ledges, and a 14-foot jump called Jaws.

While these one-of-a-kind features may sound rather gnarly, Keystone also serves beginner and intermediate riders well. Easier trails abound in the park, while many expert runs also feature "sally alleys," which are alternate routes that allow riders to avoid the larger, more technical features and instead tackle smaller, less difficult sections.
www.keystoneresort.com