Starting from the Visitor Center Parking lot, head north for less than a quarter mile then take a right onto the singletrack "Tour de Wolf" just before the road intersection. The very first portion, 100 meters or so, is rutted from frequent bike use, but once you enter the trees, the trail widens and becomes mostly flat.
The trail then winds through the forests of Shelby Farms and intermittently pops out into the open where it can be a real scorcher during the summer. Follow the regular signs and mile posts to keep on track. If you're measuring, you should be just shy of 6 miles when you finish.