I would prevent politics from hindering great advancement. We could have colonies in space by now if only lawmakers would think. Years later, we're in recession anyway. The irony.
I would probably go back to when I went on my trip to Mexico when a hot guy was flirting with me. But being the cowardly closeted gay I am, I basically (fake) laughed it off and walked away.
Stop the dark ages
"Write" songss and sell them to labels
Invent many things myself
Stop the slave trade from happening
Stop Hitler from rising to power
Etc etc
- Make sure Hitler's desk in his office was very weak and prone to "breaking"
- write a very famous book series again under me as the author and release it as a book a few years before the original author could release it imagine all of the $$$
Stop the dark ages
"Write" songss and sell them to labels
Invent many things myself
Stop the slave trade from happening
Stop Hitler from rising to power
Etc etc