Night walkers
I learned many years ago that if I go out walking at night I always carry a flashlight. Just too difficult seeing cracked walks, holes & loose cobble stones. As far as the beach goes are you talking 8:00 in the evening (most likely OK) or midnight (a definite NO NO) Unfortunately the beachs late at night attract the more dangerous elements. Here in the San Fransisco Bay area I would never walk any of the beaches late at night & practice the same caution in Mexico.