What fun! I highly recommend dragging yourselves out of bed early and going to see the Tsukiji fish market. You'll see amazing enormous tuna and other fish, and if you get there early enough, you can watch the tuna auction. If you're a sushi fan, head to one of the sushi places right next to the fish market for a little breakfast sushi. It's truly some of the freshest fish you'll find anywhere in the world.

You can hit Shinjuku for nightlife, electronics and perversion, all in one area! Shinjuku has a big shopping mall across from Shinjuku train station, an electronics area and the red light district. There's also an amazing tempura bar that Mr. Buster and I ate at in Shinjuku...when I get home I'll post the name and address. It was really cheap too, which is great. They fry up the tempura right in front of you, and when they do tempura shrimp, they kill the shrimp in front of you and batter and fry it up, so you know it's fresh.

I recommend getting Time Out's guide to Tokyo if you can find it. You probably don't need a full-blown travel guide, so Time Out ought to be all you need.

Where are you staying?