Best family vacation spots: Wilmington, Dover, Fenwick Island, Bethany Beach, Dewey Beach, and Rehoboth Beach. Best places for family vacation fun: Brandywine Park Zoo, Air Mobility Command Museum, Winterthur Museum, and Killen’s Pond Water Park. Things to do with kids. Enjoy Longwood Gardens and the Hagley Museum; have an outlet shopping adventure and ride a carousel. Go swimming, fishing, surfin, and sailing. (Image from Longwood Gardens.)