Salmon is a beautiful place that happens to be on the way to and from a lot of beautiful places. That is probably why I have found myself there several times over the last fifty years, even though it is nowhere close to where I live.
However, it shares at least one weird attribute with Twin Falls for certain, and maybe other places in Idaho. That is, the town's youth seem to be unduly obsessed with the presence of strangers in their town. Most other places in the mountain West are used to tourists, and usually pretty much ignore them unless actually transacting business with them. But in these Idaho towns, the young buzzcocks will spot you right away for an out-of-towner, and will stalk you for hours as you move about their town.
They might do it singly in a jacked-up sedan or a ratty piece of squidware motor cycle. Or they may do it in a group, pacing you on the other side of the street.
I don't know if it is some variant of the LDS xenophobia (like you would encounter in a place like Hanksville, UT), or if it would happen to you anyplace else in Idaho, or if something else is going on. But one thing is for sure; you will not be able to slip into town unnoticed.