Ill tell you what id do. I would buy a modest house in a good location. Fill it with cool electronics then give the rest to charity. Never in my life could I spend $1 Billion.
Buy mass property in countries that are not doing so well, set up factories, farms and provide jobs for people.
..What would you buy? Pick one item please, Im talking your top item, something you have always wanted. Post a picture if you can please.
Here's mine: It's a Victory Kingpin V twin. (Over 1700 cc :O)
1. Buy a new house, buy cool stuff.
2. Buy a nice car
3. Live in luxury for the rest of my life
( the rest to the poor ) 
that's it?? A billion bucks and your top wish list is a 15k bike????
(btw, why settle for that itty bitty bike? My vulcan comes stock with 2,053CC. And lets just say I'm not running stock)
... im a simply guy and i wouldnt wanna complicate things with anything like an airplane or giraffe
True, but Victory is American Made (Or at least assembled)