These 3 spots are all located within minutes from each other in Bluemont, VA. Bluemont Vineyard is a beautiful winery with great views and wine. Dirt Farm Brewing is a nice brewery with great views from the top of the hill. Great Country Farms has a wide variety of children friendly activities.
Leesburg is a cute small town to walk around with several shops and restaurants to visit.
The Steven F. Udvar-Hazy Center is the second location of The National Air and Space Museum (the other is located in downtown DC). This museum is located just minutes away from Dulles airport.