There's a story from (I just looked it up) 1944, before it was widely known the gas giants have no surfaces, about humans who modify themselves to explore Jupiter.
Before the characters undergo the transformation, they see Jupiter as a terrifying wasteland of never-ending storms - and after, nobody comes back.
If I remember correctly, the story is about a man and his dog who go through the process and then, when it is complete, Jupiter appears as a paradise and they realize that the reason people don't come back is because it's a better life once they become Jovians.
“Four men, two by two, had gone into the howling maelstrom that was Jupiter and had not returned. They had walked into the keening gale – or rather, they had loped, bellies low against the ground, wet sides gleaming in the rain. For they did not go in the shape of men.”
The end is:
"'They would turn me back into a dog,' said Towser. 'And me,' said Fowler, 'back into a man.'"
I hadn't realized how much that story affected me, because my reaction to colonizing Mars, for years, really, has been that it's pointless to try until it's practical to become Martians. Otherwise you might as well live in a cave anywhere. But I didn't link it consciously.