An easy 15km drive south of La Rochelle, the Réserve Naturelle Marais d'Yves has a free nature centre, where you can pop in and peer through telescopes to watch some of the 192-hectare reserve's 250 bird species amid the wetlands. Depending on the season, you might see flocks of over 20,000 birds fill the sky on their migratory path. The website lists various guided walks and cycle rides through the wetlands (available in English), where you'll also learn about the area's 750 species of frogs, flowers and insects.