LEARN: The Natural History Museum and the Air & Space Museum are no-brainers for kids. Older children might like off-the-beaten-path museums such as the International Spy Museum, Steven F. Udvar-Hazy Center, or College Park Aviation Museum. Kids taller than 46 inches can jump throughout the park, but littler kids can hop around the “Kiddie Court” or visit during the hours designated for the under-6 set. Less intense than a full-fledged water park—and free!—our area offers plenty of options for letting kids cool down with a good soak. Try Arlington’s Lyon Village Park, Fairfax’s Mosaic District, Georgetown Waterfront, or Yards Park for some easy splashing.