Chassiron Lighthouse is just one of the landmarks located 1.7 mi (2.8 km) from central Saint-Denis-d'Oleron, so you might want to stop by for a few pics during your trip.
Why not spend a lazy afternoon at Plage des Les Sables Vignier during your trip to Saint-Georges-d'Oleron? Make some time to visit the monuments while you're in the area.