If I could time travel, I'd go back in time... back to high school... and I'd do all the things that I used to be sooo scared to attempt or do... I'd change my past... which I hope... would change my present... and that probably... would change my future too... I imagine...

Or.... I'd just go back a few days... just far enough to buy a lottery ticket... since I'd have the winning numbers from the present... hehe