Re: If you could go back in to time only once...
I'd go back to February of this year and stop an ex-friend of mine from getting arrested. We'd still be friends if it weren't for that shifty weekend.
Other than that, I'd say I would time hop just checking stuff out. Meet my parents and freak them out when their son grows up to be that guy who said he'd become me. Unless that kid doesn't grow up, he dies young and I get adopted in his place...holy shit, I'm freaking out!