Sun Valley Resort is America’s first destination resort, originated in 1936 by Union Pacific Railroad. It is located in the Northern Rockies region of south central Idaho and is open year round with four distinctly beautiful seasons. There are more outdoor recreations here than any other destination resort in the U.S. Accommodations: The Sun Valley Village Resort sleeps 1,200 with a total of 503 rooms. Sun Valley Lodge: 148 Sun Valley Inn: 106 Apartments, Cottages and Condominiums: 249