Another activity I haven't done in Japan is going to an Onsen.
This picture below is a mini-Onsen for the feet of train passengers in front of Kinugawa-onsen Eki (Station). If only I had extra time, I would have tried this before going home.
Anyway there are still many Onsen places available out there, just like the feature in the recent Metropolis magazine (November 21 Issue).
I shall conquer this with my next trip (someday ...), even if no one will join me. :p [This is what you call realizing your dreams]