It’s a stunner in every season, though.A fall day in the Formal Garden of Hildene.Credit: Brian/Adobe StockKey PointsManchester blends historic estates, independent shops, galleries, restaurants, and classic New England scenery.Outdoor activities range from hiking and fly-fishing in warmer months to skiing and fireside stays in winter.Highlights include the 412-acre Hildene estate, walkable Manchester Center, and the Southern Vermont Arts Center…