Fodor's Expert Review Hot Creek Geological Site
Mammoth Lakes Nature Sight
Forged by an ancient volcanic eruption, the geological site is a landscape of boiling hot springs, fumaroles, and occasional geysers. Swimming is prohibited—the water can go from warm to boiling in a short time—but you can look down from the parking area into the canyon to view the steaming volcanic features, a very cool sight indeed. Fly-fishing for trout is popular upstream from the springs.