It is almost impossible to see all of DC in one or two days, so plan out where you want to go and what you want to see prior to arriving. It's easy to spend hours in just one museum. Do not assume that you will be able to see everything during your trip. I have been to Washington DC numerous time and I have yet to explore the actual city.
What we liked:
We enjoyed the room and food around the hotel.
The wonderful Washington DC area transportation system.
The seamingless endless list of things to do in Washington DC!
What we didn't like:
The heat!
The outdoor pool was closed at our hotel.
There are huge lines everywhere.
Washington DC - The Poem
Oh say can you see all the sights in DC?
The answer is no, even if they are free.
The most famous mall without any stores,
But scores of museums that are hard to ignore.
The White House, The Senate, and Memorials to visit.
The planning logistics is harder than physics.
So much to learn, there is just so much history,
Too bad that most of it will remain a mystery.
There is still much to see, still much to learn
So Washington DC, we will return!