A UNESCO Biosphere Reserve, the island of Cavalos is the second-largest nesting site in West Africa. Here you will be able to observe many bird species, including terns, in particular near the freshwater lake. Take a stroll on the beach full of shells, stretching all the way around the island’s 6-km (3.8-mile) circumference. Some rocks have mango trees growing on them, which just rise above the surface during high tide. The interior of the island, blanketed in palm trees and high grasses, is inhabited by a colony of wild pigs.