What planets/moons in the Solar System do you think are underutilized in science fiction?

Thinking of writing a space opera set entirely within the Solar System (kind of like The Expanse) and want to know what you guys' opinions are on how well our own star system is often utilized.

Whenever a story is set in the solar system, it's always something like Mars or Titan or something like that. But there's a bunch of other things in the system, too. Like all the dwarf planets in the Kuiper belt. What are some less thought of locations that I could use to keep it fresh?