For much of the world, snow days are an invitation to curl up near the fireplace with mugs of steaming hot chocolate. But for skiers, snow days are a call to action—a summons to hit the slopes in search of the best runs. The following ski-in/ski-out resorts are some of the best in the world, pairing sumptuous accommodations with world-class slopes to ensure the ultimate ski-trip getaways. —Compiled by Rebekah Bell