I thought about it a little bit when I posted the question and realized it is also a difficult question for me. I have a lot of places I want to go.
If we limit it to this planet I would probably say Scotland. We have been planning a trip there but first Brexit and now Covid-19 have been conspiring to keep us away.
If we go beyond the planet I wouldn't mind visiting an advanced alien species and experiencing what they have to offer.
Oh yes, Scotland is our list too...Like you say, just so many places! I think if it was in space I'd like to visit Pandora. Seems like a nice place, if a little dangerous.