If you get near Post Falls, visit the Buck Knife Factory.
Also, the town of Coeur d’Alene is worth a stop. Nice shops and a beautiful lake. World’s longest floating boardwalk (according to them).
If you go north another hour is an amusement park area, called Silverwood, that is a lot of fun for a day or so.
When visiting Coeur dAlene don’t hit the elk. They’re big and can do some damage.