If you like mountain scenery, I'd check out the Going to the Sun Highway. I was there on motorcycle (quite) a while back and couldn't go any further than Saint Mary Lake from the east - it was late June and the road was still closed due to snow. Ended up going further north into Canada and being uncharacteristically detained by Dudley Do-Right at the border crossing. Sat at one of these very picnic tables https://email@example.com...7i13312!8i6656
waiting after they went though all of my belongings, and DDR went off into the trees behind the building. Waited a long time, another crossing guard said I could go; but I told him DDR went up that trail there with my driver's license about 1/2 an hour ago! Rolled his eyes, ran up into the woods and returned with my DL a few minutes later. Turns out a G7 meeting was going on in Calgary, and I must have looked like the rif-raf they'd rather not have visiting at the time.
But for more of the sights, if heading north into BC, there is the ginourmous "Titan" in Sparwood, BC - you really can't miss it. Sparwood's Terex Titan - TitanCam
It was just post 9-11, and with US citizens not yet needing a passport to cross back into the US from Canada, I naively didn't have mine along. It was interesting convincing the US border crossing guard of that as I crossed back into Idaho. With that series of memorable crossing behind me, the drive down Idaho's 95/2 from the border to Sandpoint was beautiful. Only regret I have was not stopping at one of the Hot Springs to take a dip.