4 mile hiking trail located near Boulder, Colorado
From Boulder, head south on 93. After you pass Highway 128, turn right into the trailhead parking lot (if your vehicle isn't registered in Boulder county, you're supposed to pay a fee; ignore at your own risk!). You can also take 93 north out of Golden to get here.
http://www.tripleblaze.com/trail.php?c=3&i=8696