(about 75 mi. north from Twin Falls), including Hailey, Ketchum, Sun Valley. Excellent hiking and you can take the ski lifts to the top of Baldy, if you want, and hike down.
Another 60 miles up the same highway will take you over Galena Summit and down into the Stanley Basin. Area includes several large lakes and many small ones. Redfish Lake is here--so named for the salmon which came to spawn--and the Main Fork of the Salmon River starts here. There is excellent camping at the lake, the Sawtooth Mountains are drop-dead gorgeous and the little town of Stanley has a number of rafting companies that can do day-trips (or they did last time I checked! I think the area had a good water year). Also a couple of fun bars and at least one decent restaurant. 
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