For a perfect day in the Sun Valley area, start at Lizzy's Fresh Coffee. Run by longtime resident Liz Roquet, the Ketchum café roasts its own specialty coffees on-site. Roquet is the daughter of an Austrian pastry chef who moved to town in 1967 to run the Konditorei. That popular breakfast chalet still serves up an array of tarts and éclairs, along with more filling fare such as the Baked Swiss Eggs Rösti, topped with bacon and Gruyère.
To work off breakfast, head to the White Cloud Trail loop, which offers a 360-degree view of the valley's glittering fall foliage and can be accessed across the road from the Sun Valley Lodge. For a more relaxed trek, take the flat 1.5-mile stroll down Trail Creek Road to the Hemingway Memorial, near a grove of golden cottonwoods, where you can pay your respects to the literary legend.