Nerd Out
I would go back in time.  I would love to see how the Native Americans truly lived.  Just to observe and not interfere.  If that was possible, I would love to go see the Ancient Greeks and really any ancient people that I could.  It would be a great learning experience and I’m sure that it could be very beneficial to modern times to see it the way it really was.  Ooh, checking out the Dark Ages would be very interesting too.  I like to nerd out sometimes and think that the “Gods” or aliens as others believe, are truly our distant future going back in time and checking things out.