Depends... Can I travel back to my original time? If not, then I probably wouldn't go back in time any further than the 17th century, because toilets, and for that matter, no further beyond the turn of the 20th Century, because living conditions were just generally crappier. As cool as it would be to meet Jesus (actually he'd probably be pretty difficult to find), live through the Middle Ages, or witness the American Revolution, I have to remember that this is where I'm planning on spending the rest of my life. I'd say the future, but what if there's a nuclear fallout sometime between now and then and I have to spend the rest of my life scavenging for nuts and berries in overgrown NYC? The present seems good to me. I think I'd hang around in the now, and if, by chance, the apocalypse occurs, I'd wisk myself away to the 1920s or so.
If I can travel back to my original time, then everywhere. Ever. And everything. Ever.