Basically anywhere in Japan is awesome, even the "rural" areas really aren't all that rural. I actually have friends in Saitama that are doing the exact same thing! Saitama is about 30km from me, not too far from the "city". Many of those places I have never been to and I'm not familiar with, but Hokkaido is way north and cold, Chiba is basically right near Tokyo, Nara, Kobe, and Kyoto are really cool, but further away. That's about as much as I could tell you about it, you will love it where ever you go. Yokohama seems to be where a lot of the classic car places are, most particularly our beloved Datsun shops are around there. Keep us all posted what happens!

-Andy