The Salinas de Cahuil are a short trip south of Pichilemu, where salt pans and wetlands sit around the Nilahue estuary. The appeal is quiet rather than spectacular: shallow water, birdlife, and the old rhythm of salt harvesting.
It works well as a half-day change of pace after the beach. Go slowly, stop for seafood in Cahuil if places are open, and treat the salt pans as a living landscape rather than a museum exhibit.