I'm not that kind of tourist. Anyway, the films that touch me most about Japan are those directed by Ozu.
If I was going to visit somewhere solely because of Tampopo it would be the Taimeiken restaurant in Nihonbashi. I've been making omu rice for a while because I have a young child, it's not my favourite dish (few of the yoshoku favourites are, and I am no admirer of Japanese Curry), but I'd be interested in going to the place where Juzo Itami went to for help in developing the version seen in the movie.
Here's an article with more information - in English - about the Itami/Taimeiken gastronomic collaboration:
http://justhungry.com/tampopo-omurai...oku-restaurant