Five Things to do in D.C.
First off, you could live there forever and never see everything in D.C. I lived there for three months during the Summer of 2015 and didn't see everything. But there are several things to do while you're there.
See the White House
2. Go up the Washington Monument
3. See the Lincoln Museum
4. See the Vietnam Memorial
5. Go through all of the Smithsonian Musem
These are just a few of the places to visit in DC, but this can give you an idea on places to see while you're there. Visit their tourism website for more information.