The 3.2-mile Canyon Loop in the Betasso Preserve, home to a wide variety of plant and animal life and age-old geological formations, is maintained by Boulder County Parks and Open Space, which ensures a well-maintained and easily accessible trail all year long.  From dense trees and gullies to open meadows and sweeping vistas, this rolling landscape offers the beautiful views and mellow climate that is so characteristic of the foothills of the Rocky Mountains.  This trail is closed to mountain bikers on Wednesdays and Saturdays.  In addition, bikers are required to ride the loop in only one direction which alternates from month to month.
--excerpts from Steve Johnson and David Weinstein

Easy parking and access.