We spent two weeks in the area between Stanley and Ketchum and barely scratched the surface. Some of the most beautiful country we have ever seen, and that is saying a lot. If you boondock, there is plenty available, and the same for great campgrounds. Not much in the way of full hookups.
And yes, the roads are excellent -- not too steep, not too curvy.
One more thing -- there will be a total eclipse in the Stanley area on August 21. Lots of folks!!