I've been to Tokyo numerous times. On this trip I wanted to find some new spots, so I decided to book a nighttime walking tour. Simon delivered. We went to interesting, history laden, hidden spots with some of the best food I've had in all of Tokyo! On top of it, Simon (the guide) was an absolute gem to be around. We laughed, we learned, we laughed some more, and then when it was late into the night and time for us to go, we cried. Such an incredible experience.
tl;dr - Go on this tour. You will thank me later.