Mystic Lake features 18 miles of hiking trails near Bozeman, MT.
From Main St. Bozeman. Drive south on 19th Ave. At 5.09Miles turn left on Nash road. 1.7Miles turn right on Sourdough Canyon Road. At 0.95 miles you should be at the trailhead.
http://www.tripleblaze.com/trail.php?c=3&i=1431