Get a dose of vitamin D at Cala en Vidrier. After you've worked on your tan, hang around and watch the sky burst into different colors with the setting sun.
You'll be spoiled for sightseeing choice when staying in Mahón. Cala en Vidrier is an ideal place to begin here, but there are lots of other fine places to enjoy. Mahón Harbour, Museum of Menorca, and Albufera des Grau Natural Park are not far from the stretch of coastline and and will cap off your day nicely.