Probably I'd buy a laptop or netbook. Or maybe I'd be like the person who wishes for three more wishes. I'd use it to start my own bank (no worse than any other at this point) with a ridiculously high interest rate. The catch is, I would lend amounts like $1 and $5, capping at $50. For people who are short on cash. In no time, I would have doubled my money. Cah-ching!