We'll do the mall one but we won't have a car so getting to Dulles will be problematic. I guess the subway will go out there in the next year or two.
Wxman will be mad at me but I would hit the natural history museum in the mall (what the JH kids liked most), there is one with the First Lady dresses if the wife and daughters are into that. I would probably split up and catch a couple different ones due to interest. The flight one was ok, but I’m not into that as much.
Holocaust one will take time, and you won’t have enough no matter how much you allot. It is a must, IMO, though.
If you like politics, and need a work out, go to the White House and just find your way to the front door. I heard the Pres himself answers the door if you ring the doorbell on the right side of the door. May even give you free room and meals for a night or two.