Uyuni Salt Flat to visit the Incahuasi Island; this island is located in the heart of the salt flat and is the greatest of a group of islands that represents an isolated ecosystem. The island is populated with cacti species that measures up to 12 meters high, providing an impressive overview. Box Lunch. The trip continues towards Coquesa village. Ascend the Tunupa Volcano to visit the Coquesa Mummies.