A very expansive network of trails. There are some doubletrack but mostly single track. This trail can be very technical in spots. Also, it can get pretty wet in spots.
Off of Rt 122 in Grafton. Trail head ties in near Brookmeadow village. You can park at the ball field and find the trail up the street in the neighborhood. There is a sign that says "Grafton Land Trust."
http://www.singletracks.com/item.php?c=1&i=3698