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This is what I would do, with nonconformists included (the two are hardly mutually exclusive).
I taught some American undergrads who were doing a term over here a couple of years ago. I did the tourist trip thing (British Museum, Library), but one thing I had them do was design a walking tour for me. Basically gave them a zone of central London and they each had to come up with an interesting sight they'd present on. I collected them, worked out a decent walk, and had them give me (and the rest of the class) a short presentation when we got to it.
might be interesting to look at the influence of the european enlightenment on the thinking of the american civil war, and in particular british and scottish enlightnment, jefferson, locke etc. see http://www.articlemyriad.com/influence-enlightenment-formation-united-states/
then via that, there's http://www.britishmuseum.org/explore/galleries/themes/room_1_enlightenment.aspx
the mark steel lecture on thomas paine is also pretty good/funny, not that I think 16 year old kids like left wing comedy lectures http://www.marksteelinfo.com/audio/ThomasPaine.mp3