I'd also like to go back a couple of weeks and win the lotto.
"Every man's heart one day beats its final beat, his lungs breath their final breath. And if what that man did in his life, makes the blood pulse through the body of others, and makes them believe deeper in something larger than life, then his essence, his spirit, will be immortalised by the storytellers, by the loyalty, by the memory, of those who honour him and make whatever the man did live forever."
I would go back in time like a year with all the power ball and mega millions numbers written down. Would also bet on key sports match ups in which i knew the outcome. Dont think i would change anything for fear of fucking the future, but if i were, i would leave anonymous tips about the mass shootings or try to stop them.
I would give modern weapons to the Aztecs, so they could defeat the Conquistadors and preserve their culture.
Too many mourn for the Africans or the Native Americans, but the Aztec culture was far more beautiful than any of those and more thoroughly eradicated.