You don’t have a dud on that list, but if you can spend a couple of days in Gettysburg you won’t regret it. I know guided car tours (audio in your own car) sound corny, but for some reason they’re very good there. I even liked them as a kid. Your kids will love Little Roundtop and Devils Den. Can’t run around on the rocks as much as you used to, but it’s still a place where you can feel very connected to the past and history feels real. Enjoy the trip!