Small easy loop. they have a duathalon here twice a year Mountain biking and running. The loop is not so great but the race is fun.
Ashland State Park is located west of Boston in eastern Massachusetts.<br />From North or South: Rte. 495 to "Main Street" Hopkinton exit, continue east on Main Street. Before Hopkinton Center Rt. 135 comes in on the left, follow Rt. 135 east approx. 3 miles to park Entrance is on the right.
http://www.singletracks.com/item.php?c=1&i=801