I've been there 3 times myself since the missus is from Tokyo. Since we're on this forum I'd suggest the Pokemon Center Mega Tokyo obviously >.< Odaiba, Tsukiji fish market, harajuku, night life in Roppongi if you like that, Yoyogi park is really nice, Tokyo Disney Sea (They serve alcoholic beverages, not to be confused with Disney Land which is next to it), the Robot restaurant is hillarious impressive and super weird, Meiji Shrine would probably be super crowded but is a top tourist spot, Ginzai is also nice for shopping, i recomend going to yakitori places the food is just amazing, the boats going through the rivers in tokyo are nice, cant remember the names of em tho, yakabune maybe, something like that anyawy. Go to a onsen, if you got a tattoo you can try to cover it up since many Onsen's don't allow people with tattoo's (cos of the connection tattoo's have with the Yakuza) and since we all play pokemon and prolly watch anime Akihabara go there for electornic, games, general otaku culture, be served coffee by beautiful maids etc lol. Asakusa is a nice place to go also the sky tree (it's close)...That's what i can remember from the top of my head atm, shout out if it's something you're wondering about :)