If you'd like to inject a little more culture into your getaway, put Gravelines Museum of Drawing and Printmaking on your travel itinerary. See if there are any guided tours or just wander around at your leisure.
You'll have no end of sightseeing choices when visiting Gravelines. Gravelines Museum of Drawing and Printmaking is an ideal place to begin here, but there are numerous other worthy spots to explore. Gravelines Arsenal, Gravelines Belfry, and Plage de Gravelines are near the museum and will round out your day nicely.