I go over to american dream on sundays a lot to ski, and that place is still hopping even then. A lot of stores are actually open and try and skate by on very vague exceptions to the law (the hat store was open, saying they counted as 'sporting goods'). It seems to be very loosely enforced there.

Edit: its also worth noting that individual towns have their own (paramus being the most restrictive) and the overall county law is relatively loose. Also enforcement is done at the local level, which is why some towns are a little more loosey goosey than paramus. I imagine the bergen county sheriff would step in if a town really went bonkers with it so the whole thing wasn't undermined, but they seem to be cool letting american dream do its own thing, and i suspect are more of the mind that the meadowlands and the football teams will keep it relatively in check and its in everyone's interest that the place is a success. I wouldn't be surprised down the road an exemption carved out for it, and would support it.

I worked in an office in Montvale, and every so often would have to run in on sunday for something for an emergency. It was always, "ok, can this wait until monday or do we just pay the couple hundred buck fine" I forget the details, but it was reasonable if you called the cops and explained it, if they drove by and saw a car there, and caught you entering\exiting, it was more severe.

More than once i sat in the parking lot until midnight with a cop parked next to me. We all agreed it was silly, but if they didn't enforce it, everyone would quickly start abusing it and it would defeat the point.