I'm trying to think of DH parks to visit that I have not been before. We have a lot here in the northeast but i'm not sure I'm even aware of them all or if some of the ones i do know have closed (i've been out of the loop a few years). Here's what i can think of off the top of my head within like a 4-5 hour drive of NJ. Please add any i may have missed or let me know if any have closed.
Wisp, MD
Massanuten, VA
Mountain Creek, NJ
Blue Mountain, PA
Seven Springs, PA
Windham, NY
Plattekill, NY (limited weekends)
Greek Peak, NY
Oak Mountain, NY (i think they're closed)
Whiteface, NY
Powder Ridge, CT
Thunder (Berkshire East), MA
Mt Snow, VT
Stratton, VT (opening this year)
Okemo, VT
Killington, VT
Sugarbush, VT
Burke, VT
Sunapee, NH
Highland, NH
Attitash, NH
Wisp, MD
Massanuten, VA
Mountain Creek, NJ
Blue Mountain, PA
Seven Springs, PA
Windham, NY
Plattekill, NY (limited weekends)
Greek Peak, NY
Oak Mountain, NY (i think they're closed)
Whiteface, NY
Powder Ridge, CT
Thunder (Berkshire East), MA
Mt Snow, VT
Stratton, VT (opening this year)
Okemo, VT
Killington, VT
Sugarbush, VT
Burke, VT
Sunapee, NH
Highland, NH
Attitash, NH