I'd first take my time and study how it works and how time itself works, then I'd study a bunch of history, and a bunch of science, once I'm done I'd go back in time to 1,000 BCE Yukatan Peninsula and chill in the beach, meet some locals, have a good time.
And after your holiday you return and find the history books changed to Columbus discovering a nearly empty continent in 1492 and a archeological record of a big, continent wide pandemic, killing nearly all of the humans. Countless civilisations crashed by mass deaths…..
I have to counter this by saying, I don't think one got would kill an entire continent, specially cuz I am immunized myself to modern diseases, if anything I'd probably help the locals get immunized with technology.