[JohnBraden]

If you're young, (or even if you're not) the sight of thousands of people crossing the now-famous Shibuya crossing would be something to see. It's quite a spectacle in an area perfect for a Friday night. It will give you some idea of what young people do there.

I'm not someone who has been in Tokyo much-only 12 days so far (adding 11 more in 21 days!), but I can't imagine missing that place. Anyone beg to differ?

If you decide to crash, there are capsule hotels nearby as well, though I don't know how those really work.