Roving in Mars is cool, don't get me wrong. But there's a reason why by now the Red Planet has become a collective Rorschach test for all those enthusiasts striving to take Pareidolia to unexpected levels: Unless you're a hardcore geology nerd, Mars is just too featureless; too arid, too... lifeless.
Which is why a mission to Jupiter's moon Europa would be far more exciting. As explained in this video by NASA-JPL astrobiologist Kevin Hand, the Jovian world has the most ideal conditions to discover not only organic molecules churning out beneath its ice cap by hydrothermal vents, but perhaps even a whole new alien ecosystem of complex aquatic lifeforms, evolved thanks to the tidal waves created by Jupiter's massive gravity pull over its moon, as envisioned by Arthur C Clarke in the 1st sequel of the 2001 tetralogy.
That discovery would add a whole new volume in the book of Life, and would surely change the entire course of human history.