Salmon, Idaho is a small town in the most beautiful valley you have ever seen. We used to go there twice a year. The airport is Lemhi County, right in the valley. Our FBO was Salmon Air Taxi. They were super friendly last time we were there and go a loaner car.
Rentals are also available.
If you drive north out of town, you're following Lewis and Clark territory. Its very interesting and beautiful country. Unfortunately, the beautiful lodge we stayed at was sold and is now a private club. You can stay in town however and drive to the lake for a days fishing. The lake and the country around it is so beautiful it will mesmerize you.