See this picture, this the Baia de Espinho, my hometown:
I never go to the beach in this spot because it's too crowded. Nowadays, if you walk the walkways at night you have a nice view of the beach, courtesy of some spotlights, like on the picture above. These spotlights were first turned on (first time, ever) around 18 or 19 years ago, at around 10 or 11pm on a summer friday night, while me and my girlfriend were getting out of the water, naked. Made it easier to find our clothes, though.
Edit: it's the Atlantic, cold water