Welcome Joe,
As other have mentioned, ATVs are completely illegal on all state land in NJ, except the new park they opened, which will soon be privately owned. Dual sports are allowed in Wharton with registration, inspection, and a license. As much as I enjoy walking the pines, I also enjoy riding my Polaris Sportsman ATV. I try to stay out of the state parks due to the park police and find it much easier to get away with riding in WMAs. There are many with ATVs who enjoy mudding them up and tearing trails up, but I can honestly say I drive mine slow and use it soley for hunting purposes and to get from point A to point B while enjoying a slow cruise in the woods. As a rule of thumb, I stay on already designated trails and roads and never ride in the brush. I absolutely hate to see people driving through fragile swamplands and creating new trails in the brush. I would guess many people on this site are against the use of ATVs in our parks and WMAs, but I honestly feel if you're there just to cruise and leave things as you found them, there's really no harm or damage done to the woods. Driving at night can also be fun and I find there is much less of a chance to bump into the park police or wardens. There are many areas to explore if you check out the maps. Good luck, drive safe, and leave it like you found it.