"Where the Past comes Alive"--if you're on your way to Sun Valley from Boise or have an afternoon to spend in the area, head north 45 minutes on Hwy 21 to the colorful town of Idaho City.
This old mining town was once the largest city in Idaho and it now caters to tourists.
My 5-year old loved the Old West shootout at high noon with Bad Bart and the sherrif, a duo that puts on a little show in the middle of the street, a couple of times a day during the summer; check at the visitor center when you first pull in to town to find out about their performances and get a map of the town (mostly a walking tour of different buildings of which our favorite was the old prison).
In all, it's a fun place to spend the afternoon and there are several ghost towns nearby to boot. Be sure and have some huckleberry ice cream in a waffle cone at the soda shop on Main Street.