This city offers that most rare of New Jersey experiences - the free day at the beach. Atlantic City has no beach tags, so you're welcome every day, no charge.
Along with that, Atlantic City probably has the most diversity you'll find on any southern New Jersey beaches, because it draws visitors from all over the world, and not just people who live within a relatively short drive.
Plus there's more to do on a break from the beach in Atlantic City than anywhere else around. It has hundreds of restaurants and shops lining its Boardwalk, or just a few steps off the beach and the boards can get you to the casinos that attract most of those tourists, to The Pier at Caesars - with more shops and restaurants and bars, sitting right on top of the ocean - or to a pair of amusement piers stocked with rides and other attractions.
Speaking of rides, serious surfers from all over flock to States Avenue and nearby beaches for the waves. Plus several casinos have bars right on Atlantic City's beaches, so you don't even need to leave the sand to get a refreshing beverage - or to dance to live music sometimes. Some casinos even host free concerts on the beach occasionally, including big musical names that can really pack the place.
Atlantic City also offers more public restrooms than most other places - you'll find them on the beach side of the Boardwalk along most of its 4-plus-mile run through town. If they're closed or there's another personal emergency, most casinos have restrooms just a few steps inside their doors off the Boardwalk.