Poás Volcano National Park
No other national park in Costa Rica receives as many visitors as the Poás Volcano and its gigantic crater, which measures almost one mile across and 300 meters deep. It is best visited in the early morning, before clouds obscure the view. In another corner of the park, a mossy jungle trail leads to a second crater filled with rainwater, known as Botos Lake. Poás also has a visitor’s center that contains a museum and gift shop.