Get a dose of vitamin D at Plage du Drehen. After you've worked on your tan, stick around and watch the sky burst into different colors with the setting sun.
When you've finished up at this stretch of coastline in Brittany, why not make your way to Le Chorus Exhibition Centre, Musee de La Cohue, and Vannes Aquarium? They're close to Plage du Drehen and also a hit with travelers.