We go to Paragon in PA. Probably not close to you guys but a great place to ride and worth the trip.
http://www.paragonap.com/
Fee is $25 / day. They have plenty of trails from easy to rock crawling. We usually do a few trips a year with 8+ people. Have a blast!!!
Another place is down by me in the pine barrens in NJ. Not legal....we do it anyway. usually don't have a problem. Just beware of the Jersey Devil!
All our machines are registered.