Take the time to get an outstanding tour of the Naval Academy outside of DC. Also the famous Rams Head Tavern has famous entertainment in the evening (see their website for advance tickets). Note the showroom is small and unusually shaped.
annapolis is a wonderful place to getaway to for the weekend. cobblestone streets, neat little shops, good seafood and drink. go w/someone you really like.
Check out the Sculpture Garden in Washington on 7th and Madison. Jazz in the summer and ice-skating in the winter....http://www.collidingcontinents.com/2007/12/little-hidden-dreams.html