There's a few miles of flat singletrack here. There's a loop that goes around the edge of the property and a few side trails here and there. Always be looking for singletracks taking off here and there. Once you find them all, you can construct a good loop of about 2 - 2.5 miles, mostly singletrack. This is North Dakota, so don't expect any climbs or technical challenges. The good thing is that the area is heavily wooded, so it can be relatively cool int he summer.
Head SE out of town on 52. Go left after the KOA. Follow the dirt road across the train tracks and look for a gate on the left. Park in fromt of the gate and ride.
http://www.singletracks.com/item.php?c=1&i=2365