@pac12bound I’m not familiar with the quarter system, but UNC seems pretty flexible about double majoring and having a minor. My daughter is considering a couple of minors in addition to CS. You can choose up to three majors/minors as I recall.
DC will be a bit hard to reach as a first year (no cars allowed), but I suppose if he rents or brings a car out as an upperclassman he could visit DC, colonial Williamsburg, Monticello, etc. Or maybe that’ll be his cover story for taking road trips to visit the women’s colleges in NC/VA (haha).
If you and your son haven’t visited Chapel Hill (distance, etc.), you might check out the video below to get a sense of what the campus is like. Not as good as an in-person tour but better than nothing. I checked out a few videos on Youtube and this one seems like the best of the bunch.