Location: Off Mapleton Avenue, just west of Boulder
Trail Length: About 3.0 miles, loop trail that includes the Mount Sanitas, East Ridge and Sanitas Valley trails
Elevation Gain: Almost 1,300 feet
Notable Features: A strenuous trail that is very popular with the locals. Expect to share the trail with a lot of people and dogs, especially on the weekends. The peak offers great views of Boulder as well as the mountains to the west, and the descent down the East Ridge Trail is very steep and sometimes hard to follow (just follow the crowd). Once you reach the bottom, the Sanitas Valley Trail is a wide gravel path back to the trailhead.