Well, I'd....
-Buy Target
-Buy Gamestop
-Buy a DSi
-Buy DS(i) games
-Buy AC:WW
-Buy a bunch of Wii points
-Buy Blockland (Not as in a key, as in buying it to become it's co-owner)
-Persuade Nintendo to put Earthbound on the virtual console with $500,000,000,000,000
-Buy all the lego sets in the world (Except for the ones I already have)
-Donate $1,000 to homeless people
-Buy a private lake
-And a private yacht
-Don't forget a private mansion
-Buy mint-condition Earthbound carts on eBay.
Then I'd save the rest for who-knows-what.