Imagine that there is a time-machine, which can travel backwards in time (the past) or forward (the future). Eventual return to current time is inevitable, but you are allowed only 1 destination.
1) Would you travel into the future? If so...what would you want to see? Would you be brave enough to visit your own future or would you rather it remain a mystery?
or...
2) Would you prefer going back into the past? If so....would it be to an era you've always been fascinated by? Or perhaps to learn more about a mysterious event? Or maybe to your own childhood or that of your parents, etc?
I would go back in time to January 2012, give a hug to my devastated self over losing a person I was very close to and offer some life changing advice.
Well from an Astrophysical view point the past, present and the future are all occurring simultaneously depending upon the reference point of the viewer in the cosmos, but for the sake of discussion I would just travel back around some three months back and put right to a few things i have done wrong recently.