For a natural experience of a different kind, plan an excursion to the bubbling pools of Mine Onsen Daifunto Park. This place is renowned for its mineral-rich waters.
This naturally heated water source is in Kawazu, a place that has loads going for it! IZoo, Izu Animal Kingdom, and Imaihama Beach are other good sightseeing opportunities nearby when you're done at Mine Onsen Daifunto Park.