Metro/Train information: https://www.wmata.com/
Smithsonian attractions in DC are free of charge, but may require Free Timed-Entry Passes. Be sure to check out the website for additional information!
Nice place to hike and picnic with beautiful views of the Potomac River waterfalls. Entry fee is $20 per vehicle.
Large park by the Potomac River and Reagan National airport where you can picnic, walk, and watch planes takeoff!
There are a plethora of wineries in the Northern Virginia area. Follow the link for a list of local wineries.