The larger of the Lérins Islands, Île Sainte-Marguerite sits just 15 minutes by ferry from the Vieux Port. The island is mostly forested — 80% pine and eucalyptus — with walking paths circling the coastline and cutting through the interior. No cars are allowed, and the calm after the noise of the Croisette is immediate.
Fort Royal dominates the north shore. Originally built in the 17th century, it houses the Musée de la Mer (Museum of the Sea), which holds Roman amphorae, Saracen ceramics, and mosaic fragments recovered from the seabed nearby. The cell associated with the Man in the Iron Mask is the main draw, though the island's quiet beaches and swimming coves are equally good reasons to come. The western tip has some of the best snorkelling on the Côte d'Azur.