I'd travel to the biblical times and watch Mankind battle the dinosaurs.
Well I dont know about the dinosaurs bit but I'd love to go back and see if Jesus really exsisted and whatnot, hey, maybe he'd perform a miricle on me? Like making me beautiful and clever, instead of stupid and dumb! Hey, someone make a time-machine! Only Jesus can save me!
Jesus already died for you. What more do you want?! Don't be so inconsiderate.