I was much more impressed with the congressman from SS than ours from Honolulu. Much more friendly and helpful. I told them I didn't live in SS any more and didn't vote in his district.... but he said that I did at one time, and I probably have family and friends in Texas. Texas Hospitality trumps Aloha Spirit.
Washing DC is a must visit for everyone. The Air and Space Museum... shoots... like you said... everything is great.
Did you see the Marine Bks.? Their sunset flag ceremony and drill team is amazing.
Last time I visited DC was with the Boy Scouts on the way to the National Jamboree. Our Hawaii troop met up with the East Texas troop. Good fun.