I’d go to Mars. It’s most similar to earth, and relatively close to us – so much so that Nasa are planning human missions there. It has a rocky surface you can walk around on and you can see up to the stars (compared to some planets which are gassy) so I think it would be beautiful to visit. Humans will go there in our lifetime, I’m sure!
Whichever one I went to, I would want it to be habitable, with a breathable atmosphere, because I am a bit lazy and don’t like having to put in extra effort e.g. having to remember my space suit when I leave the house in the morning.
Unfortunately, there aren’t any planets like that apart from Earth anywhere near us, so I doubt I’ll get to go!