2nd or 3rd week of Oct should be the latest - It gets cold up there after that... albeit dry.
How about Monday 16th October? (9th is a holiday in Japan

)
This could be a really, really cool day out!! Can set up some cameras in cars, etc. if Brooksie fancies making a video clip. Come to think of it - if we decide on a date soon enough, Brooksie might be here then too as he's about to book a holiday for a week to Japan.
Russ (RExtreme on here) can borrow one of the cars for the day to play with too as he arrives tommorow to Japan.
He'll hate me forever if I don't let him drive the rex on the Izu Skyline
Miguel.