I'm getting ready to head back to MT for my summer guiding gig, and I want to take the scenic route. I've never been over the N. Cascades Hwy, so I thought I could take 20 all the way to the Idaho border, then take Route 2 to I-90 at St. Regis, MT. The concern I have is that, while I want the drive to be "scenic," I don't want it to be "really freaking long." So basically, I'm wondering how much slower than the Interstate the drive will be. Thoughts? Is it pretty enough to be worth it (and also to check out the Methow for next fall)?