After the tour and a bit of free time to look around on our own, we used one of the museum conference rooms to talk about our organization's priorities and how we might make our lives better and all the usual sort of stuff that one talks about at off-sites. After which we adjourned to a nearby Thai restaurant.
We're talking about future field trips, e.g. the Naval Observatory (which I have been to several times and which does, indeed, put on a good tour) and the newish Marine Corps Museum down at Quantico. My all-time favorite work field trip involved some launch facilities, but that would be a lot less local.