I have a grandson and a friend coming to US in Dec. and the only ask to see the capitol especially the Smithsonian. Would you just toad in or find a tour bus?? Or some other option?
If you are RVing into the area Cherry Hill is my recommendation too. The Smithsonian is I believe 11 different museums. They require a lot of time to see. We have been there but not enough time. We plan on 11 days with the DGKs maybe next summer.
Darn Eagle Scout program and DGD's social life. Just kidding.