I think you have a great trip planed. I lived in Salmon several years in the 80's and it is beautiful country. Depending on your rig you will have some slow going all the way from Ketehum to Hamilton MT. There several Forest Service Campgrounds along the way.
Things you can see and enjoy: Sawtooth Range at Stanley, Salmon River, Challis Hot Springs, Old Mining areas, Sunbeam area, North Fork River of No Return, Lost Trail. Just some PLaces we enjoyed.
The third weekend of July Sawtooth Mountain Mamas Arts Festival at Stanley.
Lots of beautiful country and history. enjoy your trip.