I had to post this link after seeing the pics of the Hell's Canyon flight. Idaho has some incredible opportunities for a variety of flying experiences. Our Flights of Six group has become mostly a memory, but a great one at that.
https://www.youtube.com/watch?v=Vs1Li1F29no&t=0s
A couple of scenes of river flying. The first is not in Idaho, but in Northern Nevada. For the California Kitfox guys it was a ritual to fly this river every trip coming and going to the Idaho festivities whether the factory fly-in or just flying around. With flying around in mind, the second segment is a flight up the length of Hell's Canyon with a stop at Doug Bar - 45 deg 48' 20" N 116 deg 41' 21" W