Final answer:
If a new mission were funded to land a rover on a moon, Europa would be the most compelling target due to its potential subsurface ocean and the scientific quest to search for signs of life. The mission would include a radar, a robust lander, and necessary radiation shielding. Touristic considerations for the Galilean moons and other moons imply a burgeoning space tourism industry.
Step-by-step explanation:
If only one new mission could be funded to visit or revisit a planet and land a rover on one of its moons, the case for which planet and moon would be most worth exploring centers on the moon Europa of Jupiter. Considering what we already know about this moon, Europa stands out due to its potential subsurface ocean beneath a crust of ice, which presents a compelling case for astrobiological studies. In designing a robotic mission, we must ensure the instruments can withstand the cold temperatures and limited sunlight.
The robotic mission to Europa would need to be equipped with a suite of scientific instruments, including a radar to penetrate the ice crust and search for water, a robust lander capable of surviving the extreme conditions, and possibly a submersible or ice-melting probe to explore the subsurface ocean. The goal would be to analyze the ice for signs of life, understand the geology of Europa, and study its potential habitability. Given the moon's radiation environment, the mission must also include strong radiation shielding for the electronics.
As for the other part of the question that references future travelers visiting the Galilean moons or other moons in the solar system, it suggests a more imaginative approach, thinking about potential touristic activities, which could be of interest to an adventurous space tourism industry, including rock climbing or observing unique geological features.