1. To an early 20s Hitler first to convince him that his Art was just perfect and then to the admission board of the Uni he applied to... after all someone needs to threaten them into accepting Adolf.
Oh of course I would also find a way to end WW1 before it even begun.
2. And last but not least I'd be meeting Jesus. I'd like to have a debate with him on ethics.
3. Prometheus needs to know that people can gain 3rd degree burns from fire.
4. And then I would go way back to pay a visit to Adam and Eve and that deceptive serpent of theirs, I would greet them by throwing clothes at them.
5. My last visit would consist of me finding Lucifer before he began revolting against God and tell him to "Shut the Hell up." He'd probably ask me what on Earth I was talking about- both of which would make no sense because technically there would have been no Hell or Earth. (Plus, I don't even know if time existed back then... so...)