bansama: Sorry, but I too, would be of very little help. I rarely go to Tokyo these days, and when I do, it's always to the same 3 or 4 locations as that's where children want to go. I haven't truly explored Tokyo in over a decade and, well, I can guarantee it's not the same place now it was then.
Asides from that, given the nature of my work, I could never guarantee that I'd be available. I would suggest you ask your local Japanese embassy/consulate as they are bound to have contact information for guides, etc., that could be of some use.