I am from South Jersey. I am not very happy with the campgrounds in NJ. They are older campgrounds with wooded sites that are very tight and small. Most are not well kept. No campground in Jersey has beach front camping. I wish we had some :(
The best choices in my opinion are Beachcomber , Holly Shores, and Seashore. You might have a problem at all the above. Even though they are pretty nice, it is still tight.
Have you considered going to Lancaster or Hershey? They both have nice campgrounds and plenty of things to do.