Hey Robostep,
I'm not a huge bar person, but lots of people go to the Tombs (undergrads mostly, but they have a trivia night!) The M street area has lots of eateries that are fun and unique. I like The Bayou, and they have live music + Po boys. Surfside is up Wisconsin, and is pretty popular for fish tacos and such. I would suggest heading downtown and seeing the monuments and the Smithsonian museums if you haven't seen them before. If you are coming over spring break, cherry blossoms will be out and it will be gorgeous, so definitely try to check out the tidal basin, but make sure you bring your anti-histamines! DC is notorious for causing allergies in the spring time due to all of our gorgeous flowers!