Going for an 11 day trip to washington DC. I'm looking at the quality of educational provision (Obviously I shall be making copious notes!

 )
 However.....
 I GET THE WEEKEND OFF!
 
  What can I do? Where can I go? Should I hire a car? Where are the good bars without lapdancers!? What sights SHOULD I NOT miss? 
 Been looking on t'internet...but I'd like some proper, been there, done that information! 
 Lisa xxx