I wouldn't go back. I'd go 2500 years into the future. The way I see it, society will be either destroyed by then, or actually functioning the way it should. I mean just look where we are today considering where were just 2000 years ago.
I know enough about the past. It wasn't an ideal time either. People where a lot harsher then they are now (including such thing as homophobes, religious fantatics, stone cold killers, lack of medical knowledge, lack of normal knowledge). I'd rather go forward in hopes that humanity is better developed then. I'm not so sure whether I would return either. That depends on how much I like the future. :3