Go for a stroll along the water's edge and enjoy some fresh air at Mirissa Fisheries Harbor. It's always relaxing watching the boats coming and going.
You're spoiled for sightseeing choice when in Mirissa. Mirissa Fisheries Harbor is a great place to kick off here, but there are plenty of other interesting sights to appreciate. Weligama Beach, Polhena Beach, and Madiha Beach are not far from the place for ships to anchor and will round out your day nicely.