I already travel to the future every day. It's no big deal really.

I'd like to travel to the past. Because I will be in the future anyway, but not the past. I have some decisions need be corrected too.

With a TARDIS, I don't have to choose.

To the past! To see how people used to live their lives in the old times, i think it would be a great experience! 

I would go to the past. But not my own past.  I would like to experience the 70's.  Let my hippie spirit fly free hahha