D.C. has a wide variety of museums to visit for free. Many are along the National Mall. Recommended options include: Smithsonian American Art Museum and Renwick Gallery National Portrait Gallery African American Museum of History and Culture The Hirshorn (for modern and contemporary art)
Schedule a tour of the Cathedral, walk around campus, or explore the Bishop's Garden, one of our favorite gardens in DC. There is a great little coffee shop right by the Cathedral called Open City. A 12 minute drive from the Fairmont Hotel