How to Travel Forward or Backward in Time

Time travel is unlikely to happen imminently. Time slows down the closer you get to a black hole, so if you were to return to Earth, it would be as though many years would have passed but for you, it would have felt like a much smaller time had period of time. I'd love to just freak people out right now and start naming things to worry about. Would you rather travel forward or backward in time? I think I'd like to see dinosaurs.