I would like to see rovers become more important, last time I used one was a looong time ago. Now I just use my mad skills to do a precise landing on places I want to visit. Driving rovers is also currently boring and time-consuming. I think it all comes down to how much science we can do on the surface. Right now, you just land, Observe Mystery GooTM, Materials Bay, Seismometer, Negative Gravioli Detector, etc. and you're done. Drive a hundred kilometers to the next biome if you want and do the same thing again. I think this could be fixed with different science areas closer together. This could be done with something like the "Interesting Rocks" thing mentioned above. I would love to experience getting out of my space capsule, planting a flag, and looking over the hill and seeing some strange formations or anything that makes me want to say "Ooh, let me go check that out!" Something worth walking a few kilometers other than a great view of Kerbin or a fun crater to slide down. Something worth driving 20km over rough terrain to gather rock samples from. I realize that all this might be too much to ask, and I can wait until I go to Mars myself if that's the case. But it'd sure be nice to get a little taste of what's to come.