I'd probably choose something for entertainment. Maybe see what a Shakespeare show at the Globe was really like (extremely chaotic from what I've read)
Or see Hendrix play live at Woodstock!
That makes me sound a bit shallow maybe - there's a lot of questions I have about what early Christianity was like before the Catholic church came on the scene, what sort of a ruler Richard III was, similar sorts of dry questions... But given the choice I'd probably want some rowdy entertainment