As a native of the DC area a couple of suggestions. Cherryhill is the most convenient. Don’t even think of driving into DC, take metro and I think they still offer an all day pass. Memorials and Smithsonian museums are free and doing just these can take several days ( lots of walking). Zoo is free and great for kids and adults. Again free but food and souvenirs are expensive. You can drive to some things not on DC like Air & Space museum at Fullas Airport or Gettysburg if you like history. Enjoy your time here.
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