Cheesequake
Cheesequake State Park has a few very piney sections, sugar sand and all. I believe it's one of the most northerly "islands" of pine barrens in the state.
http://www.state.nj.us/dep/parksandforests/parks/cheesequake.html
http://en.wikipedia.org/wiki/Cheesequake_State_Park
-Chase