Little Ganjin lost in big Tokyo.

Yes that's right, but before I got lost I did manage to successfully take the subway to Ginza and walk down to Tsukiji, the largest wholesale fish market in the world. I got a great picture of some red octopi and had my first Japanese omelette.
I then proceeded to Hama Rikyu, the shogun duck hunting garden where I rested in a teahouse on the pond and had matcha (Japanese bitter, frothy green tea with a sweet).
From there it was a waterbus ride to Odaiba, the reclaimed land in Tokyo Bay, to visit MeSci, the National Museum of Emerging Science and Innovation. It's a very cool interactive museum, but what struck me most is that much of what's on display there is what we were learning at Carnegie Mellon: soccer playing robot dogs, robotic surgery, designer drugs, and advances in neural understanding. It gives you chills to realise that you and your friends are trained to expand the frontiers of what is known and possible. There's also a nifty science library there where I saw a film in double live donor lung transplantation.
From there is was a monorail ride (yes, we're on the third form of public transport - I'm very proud of myself) back to Shimbashi, from where I planned to walk back to Akasaka (where I'm staying). Unfortunately I wound up a little south of where I wanted to be in Shiba/Shiba Koen. I back-tracked to Tokyo tower (Click the links for photos) and caught a subway from Kamiyacho to Akasaka.
I feel I should also mention the public toilets here, which are squat-pee even for ladies. So if you come to Japan, learn to aim.