This is a dirt road to a Historic Great Camp in the Adirondacks. A multi-use trail that allows in summer biking, hiking and horseback riding; in winter x-c skiing, snowshoeing (I'm not sure about fat tire).
In the summer there is a horse and cart that take people, canoes/kayak and cyclists (I know of one time they helped a guy with a flat tire out)
The trail has a peak at about 3 miles in (or 1.5 miles out) so you get a nice down hill ride into the camp and out the parking lot.
Here is a link to a couple hundred pictures of the Great Camp Santanoni
Flickr Photo Album