Time travel to the past or future

I would like to be able to travel to the past, just to feel again some experiences and people that I miss a lot, I don't know if I would change anything from the past, because if not, nothing of what led me to be who I am today would have happened. I think it's just for nostalgia, but I prefer that to the future, I think that knowing how things will be, would take away a little bit the illusion or expectations of what I would like to happen, I could be disappointed and not achieve what I have in mind, I prefer it to be a surprise. I would travel specifically to a moment in my past; in my winter vacations of 2013, when I traveled to Santiago to visit my relatives, among them my grandfather who had just been discharged from chemotherapy; that afternoon I spent with him I enjoyed it very much, I was very happy, maybe I would change something, but I do not know if doing so would change something of what happened; I would have liked to have accepted to stay that night in his apart...