get it plated (unless it already is) and you can legally hit up any of these places with no hassles from Mr. Ranger or neighbors...
MA Department of Conservation: Off-Road Trails
Hodges Villiage Dam isn't listed in that link but it's the closest place to ride near Worcester. its in Oxford, MA
http://www.nae.usace.army.mil/recreati/hvd/hvdrec.htm