Go for a walk by the water and breathe some fresh air at Mahon Harbour. It's always nice watching the boats coming and going.
This place for ships to anchor in Mahón is popular with fellow travelers, so put it on your must-see list. However, don't end your sightseeing there. There are a lot more places ready for you to appreciate after Mahón Harbour. Splash Sur Menorca, Punta Prima Beach, and Binibèquer Beach are nearby.