So many fun things to do, so little time! and not all of them cost that much money. There are many free things to do in Washington, D.C. There are many cultural events. Take advange of them while you can. Kennedy Center has free millennium stage performances every day. you can also get a beautiful view on the roof.
They have lectures and tours at the museums. Many of them are funded by your tax dollars, so take advange of them. If you're more of an outdoor kind of person, there are also many outdoor activities as well. There's something for everyone, so check out the list! Live your life. Enjoy!