I visited this place once as a kid...my grandparents took my brother and I for a weekend; Chuck's thread on places to visit on this side of the pond brought back some good memories of that place. If you have any interest in late 18th - early 19th century village life as it was lived in Massachusetts, this is a great place to go...and bring your kids if you have them, they'll enjoy it too! Unless they are lost in the technological wilderness we call life nowadays...then maybe you can break them out of it here.
http://www.osv.org/