Wompatuck State Park, Hingham, MA.
Let me know if anyone would like to MTBiking in Wompatuck State Park any weekend. The park has bathroom and nice trails (6, 11, and 25 miles MTB loops). Those are racing loops that park uses for Landmine Mountain Bike Classic race each Sept. Trails are not complicated - mostly single trails with middle level tech. negotiations.
I know this park and can show around. No map needed if with me - I have it handy - ;-)
See you on trails.