trail run with the sun - View this location on map boulder's open-space preservation strategy has created a ring of more than 42,000 acres of undeveloped land around the city, with 120 miles of trails. lace up your running shoes and head for the best of these: the 6.9-mile mesa trail and its more challenging offshoots like the skunk canyon trail, which are usually usable even in midwinter. don't be dismayed by the steep and paved start at chautauqua park, (303-441-3440). the north-south mesa trail path soon mellows, changes to a dirt trace and undulates through an open forest of ponderosa and douglas fir. NYT 900 baseline road, Boulder, CO Active, Kids

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