I am planning a trip to Missoula from Kimberley, BC. Google suggests taking Hwy 95 through Bonners Ferry, Sandpoint, and Coeur d'Alene. The alternate route that is suggested is to take Hwy 95 to road 2 and through Thompson Falls. The third suggested way is Hwy 93 through Whitefish and Kalispell.
I cant speak to all the options, but the drive from Sandpoint down Hwy 200 around Lake Pend Orielle is something special. That lake is one of the most beautiful I have ever seen. Continuing on down 200, the drive along the river is gorgeous the whole way to 93. Then a little barren on 93, but you are practically to Missoula at that point. I drove into Missoula that way some years back and folks down here in arid Colorado still have to hear me talking about how special Lake Pend Orielle is.
Whitefish and Kalispel route has always been a disappointment to me, though there are some cherry orchards along that route.
Check out the Ross Creek Cedar grove. Redwood quality trees in a beautiful riparian grove. All the water and lushness has shielded the trees from centuries of wildfire, so some of the trees are like 10 feet in diameter. Really, really special place. It is a little detour off of Hwy 200, heading North up Hwy 56. Absolutely worth a little detour and a short hike.
Adrien, I dont recall a sign off of Hwy 200. I think there was a sign from Hwy 56. If you have an idea of where you are going, it is easy to find and get to. Here is the Forest Service website with directions-
Though these directions assume you are headed South on 56 from Hwy 2; if you came from Hwy 200 you would be going North on Hwy 56. A quick look at a map and it will make sense. Easy to get to, good roads, straighforward.