"Parc National de Port-Cros Located where the mountains meet the sea, Port-Cros National Park is only partially visible from the shore, as nearly half of its land is underwater. While this island park offers plenty of hiking, cycling, and beach activities for landlubbers, the park’s main draw is its unique set of seven underwater hikes for snorkelers. Well-marked paths lead swimmers of all ages to Roman ruins, a reconstructed shipwreck, and protected marine gardens, while signage and buoys explain the region’s flora and fauna, which include starfish, octopuses, and sea anemones. Visitors can arrange for both guided tours and snorkeling equipment rentals upon arrival."