"the older I get the more I realize / I'm becoming just like him / you can see it in her eyes"

I'll be in DC on family business for a few days mid-July, and while the exact scope of my commitments is not yet clear, it looks like I'll have at least a half-day free and on my own. So I'm looking for something to do.

I did grow up in the city, but I left two decades ago -- my touristing ideas are out of date. I mean, I could just pick a Smithsonian (Freer/Sackler is never a bad bet, and I might get more out of it now) or finally go back to the Corcoran Gallery, but there has to be Interesting Stuff I don't know about.

Any recommendations?

(Depending on how things pan out, I may also be available for meet-ups.)

---L.