North of Manchester near Englishtown, the Englishtown Raceway Park has 3 motocross tracks that are open to ATV riding. There is a 1.5 mile expert track with a 70 foot table top and several small doubles. There is a 0.75 mile intermediate track with only small table tops. And, there is a 1/16 mile PeeWee track.
Take the New Jersey Turnpike to Exit 9, follow the signs to Route 18 South. Go six miles to the Englishtown exit. Take Route 527 South five miles. Make a left onto Pension Road (Raceway Park billboard on left). Go 1/4 mile, track entrance on the left.
New Jersey Turnpike North to Exit 8 to Route 33 East. Go eight miles to the Englishtown Exit. Take Route 527 North. Go through Englishtown. At the Exxon gas station make a right onto Gordons Corner Road. Go 1/4 mile, make a left onto Pension Road. Go two miles, track entrance is on the right.
Note: there is a lot of gear requirements, AMA membership required, and the dates/times the tracks are open to ATV is limited. Make sure to call before heading out.