The past is overrated.
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Louise said it would be like going to a 3rd world nation.
Hope your shots are up to date, don't drink the water and you'd better have a strong stomach for people who have body lice, don't bathe regularly - if at all - and lack sanitation.
I would only like to time-travel if I could be invisible in some sort of time/space bubble. I could see, but not be seen. Otherwise, I could pop into Imperial Rome and become a slave. I could appear in Renaissance Italy and instantly be attacked by street thugs, raped and then imprisoned as a whore or witch. Jane Austen's Regency England? Unless you had money and a name, you were nothing but dirt and beyond the pale of 'decent' society. You weren't even allowed into some parts of town without being run off.
I still voted ancient Rome, another planet and the future, but only if I can go as a protected 'tourist'.
I would have also liked to have seen the ancient world - before humans, with dinosaurs, and early north America, before there were Europeans here. Feudal Japan would also be interesting.