Tokyo

After three grueling months of Japanese language study, I'm ready for a break. Thankfully, summer vacation is coming! All next week I will relax in the quiet and peaceful expanse called Tokyo. But what to do? Cool cafés, restaurants, shops... any suggestions? I want to skip the major tourist attractions. Perhaps there is a .Net user's group that meets around then (which the Visual Basic Users Group Japan seems to, but I don't know enough Japanese to tell where).