One of the most genuine "mountain" sports is, of course - mountain biking.

Colorado is home to thousands of miles of trails for the biking enthusiast.
Not a mountain biker? No worries, there are plenty of places to rent bikes.

One of the best adventures you will ever find is biking down one Colorado's many ski resorts. With a realtively low cost rental, and a lift ticket - you are hauled to the top of the mountain, and on your way down!