With 4x4 vehicles we go uphill until we are at an altitude of about 1,400 m. Equipped with helmets and torches we follow a long and old canal passing exotic plants and coming into a mystic scenery, created by impressive clouds. We go through 13 tunnels on our trail to the Springs of Marcos & Cordero. Return the same way back to “Casa del Monte” (where vehicles wait). Optional: After the last spring the path leads continously downward (aprox. 1000 m) and through the Barranco de Agua ravine until we reach the laurel forest of Los Tilos with the Visitors Center of the Biosphere reserve at its end. Trekking route: 11km, duration: 5h. NOTE: steep areas on the path, the possibility of landslides.