The guide shoves a map into your hand, but it's the cliffs that do the talking. Wind picks at your hair as the Atlantic spreads flat and blue, and the path hugs a lip of limestone that drops in clean, sheer faces to beaches you've only ever seen in postcards. The walk opens at Alfanzina Lighthouse, a squat, weathered mark on the headland where guides point out how the sea carved the coastline into shelves, arches and isolated stacks. From there the trail threads past Carvalho's tunnel mouth — a natural keyhole you step through to arrive at a beach framed by orange cliffs — and keeps unfolding south toward Marinha, which often stops people in their tracks.