I would get the time machine. I would go back in time and give myself an almanac, or even better, buy a lottery ticket... The I would go back and never use the time machine again, I'd just live from the money. I would use the time machine just one more time, when I'm an old man, almost dying: I would go back and promote chaos and havock, I'd prevent the Kennedy's assassinations, I would burn the Ed Sulivan theater while the Beatles are performing, I would kill my grandparents where they are just babies, I would kidnap Hitler and bring him to Japan so he could become a Gaijin Samurai, I would destroy the Lumiere brothers film camera... You know, just for fun, and then go back and laugh of the consequences, that is, if the universe don't colapse because of the paradoxes...