That drive to Boise is boooring, though, isn't it? There's those long, straight stretches on the 84 where you can just kinda let go of the wheel if your alignment's good.
If you have 10+ hours to kill, driving over Mt. Hood and hitting the bluffs and fields of the middle of the state is pretty awesome ( just gas up at every chance you get, and don't drive with someone who has vertigo).