As much as I'd want to say that I would go back through history in an attempt to end all wars before they ever begin, that would be impossible. So...
1 - I'd go back in time to work for a day. I would then put the money in my savings account, and with interest, when I go back to the future I'd have more money.
2 - I'd bring the technology of the future with me and sell it.
3 - I'd pretend I'm on a secret mission from Starfleet, just to see what their reaction would be. It'd be even better if I could bring a spaceship back in time with me.
Why can't I just live in the future?
