How many days would you allow to see national mall area &Smithsonian museums? How about other must-sees in the area? Would you suggest staying in the Alexandria area separately, or is it reasonable ...
Do the Capitol tour and then head to the Library of Congress. Fantastic architecture. Take one of the hop on hop off bus tours which will give you a quick overview. Also try the capitol night time tour - well worth it. We've been to DC twice and not seen every thing. Stay in Cherry Hill, it's convenient to Metro which is the way to get around DC. Enjoy your stay!