Lucky Run Park 
2620 South Walter Reed Drive
Arlington, VA 22206
703-228-3000
http://parks.arlingtonva.us/locations/lucky-run-park/
Park: Hike, Picnic, Walk
Enjoy all eight acres of passive park complete with a stream, benches, open green space, and a trail linking to the Four Mile Run Trail. Visit website to learn if your dog can safely play in the stream.