Not that this will be something any teen wants to hear from a parent, but what the heck, I will throw it out. Suggest laptop summer school, maybe to preview something the teen is taking in the fall or is considering taking in the future. There's a list of free online courses in The New York Times' Education Life section, including offerings from M.I.T, Yale,Carnegie Mellon and others.
YouTube is even involved, sort of, by offering the first lecture in a series of courses ranging from moral reasoning to modern theoretical physics. A virtual Whitman's Sampler of intellectual delights! So make the suggestion. What's to lose? I'll even give you the Mom's College Cram Course badge of courage for trying.