Cerro Chato (Chato Volcano)

While the Arenal is the most famous volcano in, well, Arenal, there is actually a second volcano: the Cerro Chato. Dormant for some 3,500 years, the volcano has two peaks as well as a sprawling crater in the center filled with turquoise water (swimming not recommended). If you’re looking for a challenge, hikes through the tropical rainforest are magnificent, but it should be noted that climbs are pretty intense and therefore ideal for active types in good physical shape.