Chato Volcano sits directly beside Arenal and is completely overshadowed by its more famous neighbour — which means it offers a more peaceful, less crowded hiking experience. The trail to the Chato crater lake climbs steeply through primary cloud forest, a humid world of mosses, ferns, and orchids with significant wildlife: toucans, monkeys, and if you are lucky, a resplendent quetzal. The hike takes about two to three hours each way and requires reasonable fitness.
The reward at the top is a pristine crater lake surrounded by cloud forest — genuinely beautiful and almost always uncrowded. The trail starts near the Arenal Observatory Lodge on the south side of the volcano. The climb is steep and can be muddy; good boots are essential. The descent returns the same way, so early starts are worthwhile to make the most of the views before afternoon cloud sets in.