Yellowstone Lake lies at the center of an immense caldera left behind by the collapse of the Yellowstone super-volcano during its last massive eruption 600,000 years ago. The volcanic activity continues to this day and there are many examples along the shores of the West Thumb, including geysers, hot springs, fumaroles, and boiling mud pots. Come paddle along the pine-fringed shoreline, and explore the geothermal activity along the shoreline, paddle by underwater geysers, watch for wildlife like elk and moose on shore, and stop for lunch at a secluded beach along the way.