Thanks for the tips, I had all that and more. Breakfast at the fish market was a definite highlight and I'm hoping a real tepanyaki experience has broken my boss of wanting to eat at Benihanna for good....Midori Sushi if you happen to be near the Ginza. Reasonable prices for good sushi and open on Sunday.Hey, I'm headed to Tokyo on business next week. Any recommendations?
For street food, get yourself some takoyaki (octopus in fried batter) anywhere there's a stand. You'll recognize them by the array of hemispherical fryers in which they turn the cooking balls of batter.
When in doubt, find a noodle shop. The charms of a good bowl of noodles are best explained via the 1980's-era movie "Tampopo". Rent it before you go.
If you're unaccompanied and don't know where to find good food, get yourself to a major train station or the basement of department store. There will be plenty of good restaurants there.