Found an unknown (to me) bike path this weekend when the family and I went to Hartwick Pines to see the color and canoe the Au Sable with my boys. My wife and I noticed an MUP running between Hartwick Pines and Grayling. It was in very good repair with lots of great scenery and looked like a very enjoyable family ride. (The canoe ride was nice, too, if anyone's interested. We used Ray's Canoes).