Some nice single track sections but mostly double track, some mushy single track, lots of rocky roads and some fire roads. The map you get from the ranger station is not great and the trails are not marked very well. I would not recommend going up Summit trail, its named that for a reason but the decent was fun which brought me from 1150 ft to 950 ft or so.
Exit 9 off I-90, take route 84 to 20 west about 10 miles look for signs for Brimfeild state forest (or Dean Pond Recreation Area)- left turn
http://www.singletracks.com/item.php?c=1&i=4543