For an occasional strol n shoot on the beach, the salt air will not harm your camera. The problems occur when storing your camera in a damp salt air environment.. such as hte iron railing n speakers you saw that are constantly exposed 24/7.
I kayak on the Long Island Sound with my camera in a dry bag. When I need to shoot I take her out n return it to the bag once done. But realize I do this to protect my equipment from splash n in case I capsize. Otherwise If I were on a normal boat I'd have it on my shoulder.
AS everyone said, wipe down the equipment n store it in a dry place as you normally do. The Hassie went to the moon, why should a beach trip be any different?