Despite being the largest of the Lérins Islands, Île Sainte-Marguerite is still petite. Visit on a private cruise from Cannes or on a day trip by ferry. Once on the island, it’s possible to hike a trail circumnavigating the island through eucalyptus groves and past stunning French Riviera views in just 2.5 hours, stopping to picnic while overlooking the Mediterranean Sea. Other island highlights include the famous Fort Royal, which once imprisoned the “Man in the Iron Mask” and is attached to the small Maritime Museum (Musee de la Mer) featuring historical shipwreck artifacts.