The hike (7–8hr return) up the verdant slopes of dormant Volcán Maderas is less arduous than the steep climb up and down Concepción, though it can nonetheless be a muddy and slippery walk – guides are mandatory. The final stretch down into the crater is not for the faint of heart; the rocks are almost sheer and you’ll have to use a rope. Birds and monkeys can be heard (if not seen) all the way up, and the summit gives stunning views of Concepción and the lake. The crater itself is eerily silent and still, its lip covered by a mixture of dense, rainforest-like vegetation and a few bromeliad-encrusted conifers. Make sure you take plenty of water, sunscreen and perhaps a swimming costume; the crater lagoon is swimmable, if pretty mucky.