Prepping for Tokyo, Osaka … what else?

I just bought the tickets and confirmed: I’m heading to Japan in October.

So far, I know 3 things:

1. I’m going to land in Tokyo
2. I’m going to be in Osaka on the 24th and 25th speaking at ACE 2009
3. I’m going to fly out of Tokyo

The question is: what else should I do?

Should I try to visit Mount Fuji? How far is it from Tokyo … and how much time would it take to climb? Should I spent all my time in Tokyo – in a city of 12 million or more there’s got to be plenty to do. Questions, questions, questions!

I’ll be researching this in the next week or so – any suggestions would be much appreciated!