Sierra Negra

Strong hikers can attempt to scale the Sierra Negra volcano, which boasts the world's second largest volcanic caldera. The hike can take visitors to the rim of the imposing 6-mile wide crater and over alien volcanic fields and landscapes, giving them the opportunity to admire strange and interesting geological features and to enjoy the views of volcanoes on other islands from a distance. Visiting the volcano can mean a total of 6 hours hiking, though, so make sure you are prepared for such an adventure.