If i could visit any planet (assuming you mean i could visit planets that we can't actually live or survive in) then I would visit the sun. I would visit the sun because it is in the center of the Milky Way and all planets go around it so it is somewhat special.
i mean the sun ISN'T the center of the milky way i think you're thinking of our solar system
seeing earth from mars would be pretty cool too
In my honest opinion, I would want to visit Neptune because with it having a methane atmosphere mixed with other elements would be fun to cruise about. If I were to go there, I would also try to find any form of life (even death of a creature) to see how it has either adapted to the deadly gas or just to find out what type of life can even touch the planet itself.
i would visit saturn because its the farthest planet from earth and it has an extraordinary rings.
If we had suits that could withstand extreme conditions we still couldn't go to far away planets just because of how far they are from us, we would simply die of old age while we are on our way to those planets.