The Edo Tokyo Museum (that's a smudge on my lens, not a UFO).
The Edo-Tokyo Museum is full of detailed models like this about the history of the city of Tokyo.
The view from the restaurant in the top of the museum.
Stumbled upon a park near the museum.
The Sumo arena (Ryogoku Kokugikan).
The wrestlers come out in a parade and then do this awesome dance (here is something else's video of it).
Preparations for the bouts.
Here are a series of videos - click to watch. They progress from lower ranked to higher ranked wrestlers(is that what they are called?) in these 3 videos.
In the last bout, the Yokozuna was upset by the challenger, which leads to the crowd throwing their seat cushions into the ring (a traditional response reserved for upsets in the last round, because otherwise you don't have a seat cushion). Sorry the video quality is not great. Email me if it's not visible and I'll post it on youtube or something better.