Ideally, you would want a cove/bay with a really long sandbar and somewhere where the swell refracts into. Most of The geography unfortunately of nj/ny is straight wide open coastline.
So you're stuck basically looking for where a lot of sand built up with a fairly long sandbar. This can vary because of shifting sand. Check a bunch of spots. There are some spots that generally work better than others obviously. That goes for anywhere.