Pittsfield State Forest
Honolulu / Turner Loop
Advanced mountain bikers will enjoy climbing the Honolulu Trail (2.5 miles up @ an 8% grade) and going down the Boyscout and Turner Trails (2.2 miles down @ a -7% grade). Nothing very technical, just a lot of climbing and a lot of descending. Route is great in the opposite direction too.
The super secret underground map of the Pittsfield State Forest should give you a good idea of all the trails out there.
Recommended Route: http://www.mapmyride.com/routes/view/481538928.