This is a newer trail system that is really starting to take off (9-27-2013). It is comprised of about 11 miles of tight, twisty, and technical singletrack with some short steep climbs. The trail is meant to be ridden counter-clockwise. There is some marking right now, however real signage is in the works.<br />
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http://www.andrews.edu/life/rec/area_recreation/andrewstrailmap.pdf
From US 31 and Old 31 (M-139) head east toward town. Take the first left at the Korean church. Take that road back until you see the parking lot on your lefthand side. The trailhead is across the street.
http://www.singletracks.com/item.php?c=1&i=7512