Absolutely gorgeous for the first couple of days; but then the scenery doesn't change. Best part was the segment called "Route of the Hiawatha" along an abandoned railway line, going over railway trestles hundreds of feet high.
If you stop in the Town of Harrison Idaho be sure to stop at the Cycle Haus -- both coffee and beer. (I had at 10 AM beer flight with four samples.)
The town/lake of Coeur d'Alene is off-scale gorgeous, lots of good restaurants and beer. Trump Country, too.
The entire TOWN of Wallace ID (silver mining) is on the national register of historic places. There's a great micro brewery there, City Limits Brew Pub / North Mountain Bar and Grill.