Winter in northern DelaWare No less grand are the other du Pont ancestral homes and gardens: the reenactments and sprawling grounds of riverside gunpowder works at Hagley Museum and Library and the mansion, chauffeur’s garage, and beautiful grounds of the 77-room Nemours Estate , decked out for the holidays each year with lovely traditional décor. If formal gardens aren’t your thing, try your hand at Delaware’s only publicly accessible rock-climbing wall, or bike or walk through the paw-paws at Alapocas Run State Park , where river meets forest in the middle of the city. Head 10 minutes north to Brandywine Creek State Park , an old-growth woodland that includes four nature preserves, several great hike-bike trails and, if the weather cooperates, sledding from the top of Hawk Watch Hill. WILMINGTON hagley Museum and library 59 VisitDelaware.com