I went to go check out this trail in Milford that was pretty cool. It had some very impressive trails, jumps, all around good trail. NEMBA did a good job in conserving the land for mountain bikers. I would recommend.
This is the info about the trail: http://www.nemba.org/ridingzone/Vietnam.html
Some more trails in the New England area:
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Thread: Milford, MA: Vietnam Trail