Mountains! Mountain! Mountains! They create lots of sledding fun for us in the Hailey community.  Most of our sledding options are rather informal such as the small hill located by the Quigley Nordic Center in East Hailey.  Or hiking up Rotarun Ski Hill and sledding down 2 miles west of Hailey. 
As you head north into Ketchum, Penny Hill is another favorite of locals to sled with the kids.
But if you are looking for a more formal experience that includes family amenitites, hit the new Snow Tubing Park at Sun Valley! They have three 600-ft lanes to tube down.  Now, how fun is that?   
Call the Hailey Chamber Visitor Center for any information on these and other local sledding options.  208-788-3484