Created to protect an extraordinary environment, this park is the “Yellowstone” of Costa Rica. This volcanically active area has numerous steaming fumaroles (volcanic vents) which can be detected at a distance by rising steam clouds through the trees and the odor of sulfur nearby. Numerous rivers in the region have geothermically heated acidic waters, and in one section hot mud boils and bubbles and is known as “Las Pailas” or mud pots. On your guided hike, you will travel on mostly level terrain through this otherworldly landscape of fumaroles and mud pots, and also walk through sections of old growth forest with trees that may be centuries old.