This 2,660-acre state forest was formerly a Civil Conservation Corps site. Several CCC buildings are still there for viewing. Hiking, Walking, mountain biking, hunting, horse back riding, cross country skiing and snowmobiling are popular activities at this year round park.
From 495: Take exit 21B to Upton. Follow for about 5 minutes. Turn right onto Westboro Rd (Pratt Pond will be on your left). Follow for about a mile and a half or so and Upton SF will be on your right.
http://www.tripleblaze.com/trail.php?c=3&i=4284