Actually, I'd buy land somewhere in the world and make my own nation state. And, I'd have cement bricks made like Legos so everyone can make their own real house build as if they were minifigs.
i have a better idea id buy the internets.
I would buy the internet.
I don't think that would be enough.
I'd buy meself an endless supply of Hamburger Helper.Mac N' Cheese + Hamburgar FTW!
I'd give it to the government, and then make them agree to the terms stated in Armageddon. (never pay taxes again, no criminal record, etc)