Yeah - You need to go either down to the NJ Pine Barrens ~ 1.5 hrs south of you, or west to Rausch Creek in PA

http://www.rauschcreekoffroadpark.org/


The Pine Barrens are free, and there's 100's of miles of trails, none of it hard core except for mud and sugar sand, etc.

Rausch Creek has a huge variety of trails, lots of trails rated for stock trucks, and trails all the way up to the ones used for professional rock crawling competitions. RC is not free, but it is subsidized by the state....and you and your family, etc....can spend the entire day off roading for less than the cost of what you'd probably spend to see a movie together.