Venus. There are some fascinating photos.

Any place that has life, if it does. Like the theorized oceans under the ice on Europa or Enceladus. I want to see it. Otherwise, maybe Daphnis or Pan in Saturn’s rings. The view would hopefully be spectacular.

I'd like to see Jupiter from the surface of Io, it is about the same distance than the Moon is from Earth but Jupiter is like 40 times the radius and has colours.

A flyby of the rings of Saturn.

Outside the solar system, any nebula and go just far enough as to see the entire Milky Way from the top.

I don't think that I have a lot of interest in sight-seeing.

However, we do have some candidates for potentially-habitable exoplanets, where we don't have enough information due to our distance. Hard for astronomers to gather data. But you can see it

maybe take photos or whatever.

https://en.wikipedia.org/wiki/List_of_potentially_habitable_exoplanets

Maybe consult with people who study them, get the most-likely candidate on that list and travel there and report back.

Statistically speaking there has to be some other life out there. Although, with how rare that is and large the universe is, we'll never find them, and they will never find us.

But with the magic of your question? I'll go to the nearest planet with another spacefaring civilization!
I just need to remember to bring my towel.

Whichever closest planet has intelligent life that’s amenable to receiving extraterrestrial visitors so I can tell them “don’t worry guys there IS life out there and we’re rooting for you.”

Honestly, a nearly uncountable number of options, and you want me to pick one? I'd like to visit the Greater and Lesser Magellanic Clouds just to see our closest neighbors at the galactic level and look back at the Milky Way. I'd like to visit Andromeda, I'd like to visit all the bodies in our solar system that are large enough to collapse into a spheroid. I'd like to visit Halley's Comet on the far side of its trip. I'd like to visit Alpha Centauri, just to see our closest stellar neighbor. I'd like to visit the nearest star to Sagittarius A*. I'd like to visit a recently collapsed stellar nursery, and a recent supernova. After the more interesting things, I'd like to see a few hundred ringed planets, a few hundred planets in the goldilocks zone of their stars, some single and binary star systems of all the major types, and on and on.

And if all that was an option, why wouldn't I want to live forever?

Well I hear enough about Alpha Centauri, so a planet there.

In this solar system, I think I'd like to visit one of Jupiter's moons like Europa.

Outside the Sol system, I think I'd like to go to the Trappist 1 system to see if any of those exoplanets have liquid water.

Sagittarius A. Just to see what it's like

Betelgeuse (red supergiant). Super impressive in Elite Dangerous, real thing would be something to see.

The Sun

That'd be a nice, quick end.

I'd wanna walk on the surface of the sun.

"You got a death wish or something?"

No; I am assuming there would be sufficient tech to actually go to the sun and walk/swim on it. I bet it feels gnarly as hell and nobody else would think to do it.

Ganymede

Titan : https://xkcd.com/620/

!FloatingIsFun@fedia.io

I'd like to see the exoplanet that rains gemstones and amonia in a 1000kmh gale over lakes of mercury or whatever mad environment they were hypothesising, I forget.

The sun

Well, in Red Dwarf, there was word of 'a moon which was shaped exactly like Felicity Kendal’s bottom ... '

Definitly Titan. I wanna make love on the shore of a liquid methane sea.

Kepler-442b

PSR J2322−2650 b, to watch the eternal sunset while walking in the diamond rain! Well, not exactly walking, as there is no solid surface on this planet.

More realistically, I'd like to visit Venus, Titan, Europa and Enceladus. Venus and Titan have opposite extreme conditions while maintaining a dense atmosphere and a solid surface, so it might be quite interesting to watch closely and compare. And Europa with Enceladus have a good chance of keeping extraterrestrial life in the depths of their oceans.

And of course, landing on 1I/Oumuamua and 3I/ATLAS would be thrilling!

Not sure if this is in the spirit of the question, because I know nothing of celestial objects.

I'd want to go for away to see the milky way from outside, like how we can see the horsehead nebula.

Failing that I want to go to the exact centre of the universe, or the very edge.

Set sail to the most habitable world outside of Earth! Whatever we deem the most likely exoplanet to be earthlike on the day our fusion drive starts the acceleration burn, that's where I'd want to go looking if there's a second evolutionary tree to explore.

How did they solve heat management? Did they develop photon-sensing organs like we did? What's the mechanism for passing genetic information between iterations (maybe they don't call them generations)? Do they flap their meat to communicate, the way earth animals' vocal tracts do? Are they made out of meat?

And if there is no life, I'd learn a lot about geology, the local solar system and, subsequently back home, all the more appreciate what we've got going on Planet A ❤️

Uranus

I wanna go to URANUS

Thessia

A few neighbours that are supposed to be earth-like.