DEPENDS... do i have cash with me?

Yes. You bought plane tickets, have a hotel to stay at, and money to spend. A typical vacation.

then me and my friends would spend all day in Akihabara then the next day just visit Nintendo of japan, and wrap up going to the Pokemon center.

I would go check out Tokyo and maybe go see Mt. Fuji

i'd wanna go visit the fox village and the deer village places.

then i'd probably go looking around Akihabara, go out to Osaka for some relaxing country fun.
Probably would wanna go out tot he Iga region just or some obviousness.


then i'd also probably go visiting a lot of the Shinto shrines and finding some of my roots for my heritage out there somehow too :3

I'd stop by the Gundam Cafe, probably every day that it was feasible to do so.

I'd definitely spend WAY too much money playing Border Break at various arcades, which definitely means there'd be an Akihabara visit somewhere in there.

Mecha model shopping would be a must, I'd be on the hunt for some vintage stuff, or trying to stock up on kits that we rarely see over here in the States. Like holy crap, Macross kits are SO MUCH CHEAPER over there.

Since all that takes money, I'd definitely want to pad the trip as much as possible with visits to my favorite Japanese speedways. A visit to Tsukuba Circuit might actually be higher on my list than making it to the Gundam Cafe.

And of course, the obligatory fox village visit. :D

Go to the real life places where some of the anime are based on.

Well, if money is no object, I'd for sure do some research (Those that answered above me seem to know WAY more sweet places to go than I do)
I'd stay in a capsule hotel, check out the Tokyo Big Sight (hopefully a convention is going on at the time as well) definitely visit Tokyo Tower & Shibuya 109, try out some authentic Japanese foods I've read about in manga and seen in anime, totally got to check out an arcade or 3, visit a maid café, just because why not?
Buy some sweet hentai, doujinshi and dakimakuras (no shame when I know that no one knows me or will likely ever see me again, ya know?)
Maybe try out an onsen, gotta try out as may anime/manga staples IRL as possible~
Find a panty vending machine, just to prove they are real... as well as check out one of those bizarre condom stores I've heard of. (it just blows my mind that they would have an entire store dedicated to prophylactics)
Umm, what else? Ride the Shinkansen bullet train, visit a Shinto Shrine,ih and I gotta get and visit Weekly Shonen Jump, love those guys~! (I wonder how accurate Bakuman. is...)

That's all I can think of at the moment, but I know I'd want to stay a while and try to check out everything!
I'd just be worried I'd end up stuck there like Piro & Largo in MegaTokyo.
Definitely want to do like those above me and go to Akihabara, Osaka, Nintendo headquarters, Pokémon Center, investigate what this "Fox Village" is... that intrigues me...

I'd buy lots of eroge and doujins that I can't seem to find here :< particularly those and merchandise from some of my favorites, like Morenatsu and Build Tiger

I'd also buy the Blu-Rays for Osamu Tezuka's Metropolis and The Boy And The Beast/Bakemono No Ko (and some for friends, too)

I forgot to mention, Professor Layton and Bowser collectibles. I like to collect.

Edit: I could've just end edited that onto my last reply. XP

I'd likely just take a tour of the land to see how its like. If I like it enough, I'd take a look at all those fancy anime, toy, game and Pokemon shops they've got going there. Just need to make sure that english is spoken there, otherwise it feels ankward if you're the only one who can't speak japanese. and need to hire a translator.

Ramen and Sushi, look at the historical stuff and mauybe go camping. and i'd bring you, cause you'd have fun.