Idaho Falls is a gateway city. To the east you can travel to Jackson Hole and Yellowstone. Both places are under two hours away and the hotel prices I'm Idaho Falls are much cheaper than staying in Jackson Hole. But the place to visit is the area around Hesie Hot Springs. The South Fork of the Snake River is located here and offers plenty of hiking, fly fishing, fishing and scenery that is a outdoorsman dream. I spent two days on the river and caught my share of brown and rainbow trout. Jimmy's Fly Shop located in Idaho Falls can supply you with all your fly fishing and fishing needs and the owner will put you in the right direction. https://jimmysflyshop.com/
Just beautiful