Delaware family vacation ideas include interesting things to do with kids and family-friendly hotels with seasonal vacation offers. Create a city adventure in Wilmington or rent a beach house on 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. Enjoy Longwood Gardens and the Hagley Museum; have an outlet shopping adventure and ride a carousel. Go swimming, fishing, surfing, or sailing and add to the list whale watching. More Mid Atlantic family vacation ideas.