Now that Kerbin has been beautified in 1.9, why not climb its tallest mountains, those over 6000 meters tall at the summit! Most of these mountains are very impressive yet have most-likely NEVER been climbed with a stock vehicle. You can be the first! CASUAL:
You can start as high as 2400 meters.
You may use thrust engines, parachutes, propellers or drains or whatever you want, so long as you subjectively feel you made a rover, not a plane or a rocket.
Getting over 6000 mete