I would be
Time Warp Investor Girl (TWIG). I could go forward in time, get the stock pages from tomorrows Wall Street Journal, then go back in time and buy call options for the big movers. I would MAKE A FORTUNE much of which I would spend on animal rescues and the destruction of puppy mills. I would also spend a good amount of money on totally frivolous things with no socially redeeming qualities like plastic surgery and pedicures.
Just for good measure, I would also have x-ray vision. It really has nothing to do with TWIG's mission, but it would be fun.
Kudos to you, d4nimal for a great thread idea. You are my kind of guy.