The main lodge at America’s first ski resort is reborn.

Why Go: Owned since 1977 by the Holding family of Sinclair Oil, Sun Valley Resort has been well maintained with express ski lifts; marble-clad, on-mountain day lodges; and 45 holes of golf. To access the world-class amenities, many visitors braved small rooms and bathrooms in the resort’s main lodge. But not anymore. In June, the 94-room Sun Valley Lodge reopened following 10 months of renovations. There are now 54 fewer guest rooms (from $329) and fiv…