A nice, shady trail traveling along the gorgeous Hunter Creek with some good climbs but amazing views. It is an all around great trail, and because there is a network of trails here, you could spend all day exploring.
From Highway 82 in Aspen, CO, turn north on Mill Street until it starts to head up Red Mountain and becomes Red Mountain Road. Continue on this, then take a right on Hunter Creek Road. Trail head is on the right.
http://www.singletracks.com/item.php?c=1&i=4665