The Best Sight in South of the River, Lisbon

The wild hard-to-reach Ribeiro do Cavalo has dazzling white sands and crystal-clear water in several shades of turquoise. Curiously formed rocks jutting out of the water are encircled by all manner of colorful fish, so bring your snorkel gear. During the summer, regular boat services speed sun seekers to and from the beach and Praia do Ouro in Sesimbra (a 10-minute ride), but for the rest of the year it can only be reached by private boat, kayak, or by a steep half-hour walk along a very rough track. Look out for the purple markings on the rocks that indicate which way to go. Amenities: none. Best for: snorkeling; swimming.