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I agree with @sdl0625 in eating in the basement of District House (H St or Eye St entrance between 22nd and 21st Streets). If the weather is really nice, you can even grab your food to go and eat outside in Kogan Plaza across H St.
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I’m not sure what’s on the tour anymore, but some less-common things you can check-out for a “feel” of the school:
The Mount Vernon campus (accessible by the shuttle near 23rd and G St), in case it’s not on the tour it’s definitely something to see if your son is enrolling as a first-year (if he’s 20 then I guess it’s more likely he’s an upperclassmen and then the Mount Vernon campus isn’t necessary)
Depending on your son’s intended major, I’d check-out the corresponding academic building where they’d be taking most of their classes (Elliott School, Business School, etc).
I think it’d be a good way to get the feel of the campus by walking from the NW corner to the SE (or the other way, depending which is closest). The campus itself isn’t huge and this would be a neat way to get a feel for the size as well as soak in the scenery when you’re not being quickly ushered around in the tour. My recommendation would be to walk from the Foggy Bottom Metro to the Elliott School on E street (1957 E St). It doesn’t really matter which streets you take between, but since they’re offset east-west a few blocks you’ll have to zig-zag a bit.