Go for a stroll along the water's edge and get some fresh air at Mulberry Harbour. It's always nice watching the boats as they come and go.
This place for ships to anchor is situated in Arromanches-les-Bains, a place that has plenty of things going for it! Cathedrale Notre-Dame Bayeux, Museum of the Bayeux Tapestry, and Gold Beach are other worthwhile sightseeing opportunities nearby when you're all done at Mulberry Harbour.