> the most interesting things you can see are the dust
  > devils and maybe/hopefully, ice formations

For the geologists who designed the scientific instruments on Curiosity, the most interesting things they can see are rocks. Lots of rocks, from different periods in the geologic history of Mars.

This is why Gale Crater was picked as the rover's landing site; there are several nearby features, including Aeolis Mons, that will provide the rover with an opportunity to date and investigate rock layers from different eras.