Tokyo comes to you

Me, a pile of passports, a marriage certificate, and my new backpack are going to Tokyo now. My lovely wife will meet me tomorrow, we will get some fingerprints taken and hopefully get visas to the UK. After that, we will have almost 6 hours in one of (if not the) greatest city in the world. One of my friends said yesterday that there is (and I'm quoting here) nothing to do in Tokyo. I, respectfully, disagree.