Spent 6 months in Idaho Falls back in the late 80's. Things I remember about the place.
Lot of outdoor things to do. We spent a lot of time 4x4ing out in the desert and mountains. The Snake river ran through the city so it was always easy to find a great fishing spot. Was out there during the summer, but it looked like there were a lot of great skiing options. They love their dams up there so there are a lot of reservoirs to go boating and fishing on.
Culturally, the two biggest things I had to adjust too were: The Mormons have a lot of influence in the state. You will run into a lot of strange laws but they usually have a loophole you can use to work around them. Guns are considered a proper fashion accessory. It is an open carry state. Was not uncommon to see people wearing a revolver hanging from their hip as they went about their everyday life, such as shopping, going to church, and going to the the circle k outside of town to buy their beer.
The weather: Summers are dry. People there talk about the forest fires like people here talk about the crops. We got a foot of snow on Thanksgiving day and none of the locals seemed surprised.
That was back in the late 80's. Heard a lot of people from the coast moved there during the housing boom in the 90's, so do not know how that changed things.
I would move back there if work gave me the chance.