You should also spend some time reviewing the
San Francisco link - I also think for a 15-yr old, (if he hasn't been to the real country) a side trip thru Chinatown can be fun, also. Intro to Dim Sum, tea tasting, and bargaining (if you enjoy that sort of thing) can be real eye-openers for a 15-yr-old. For about a dollar each, the 4-packs of scented chinese soaps make great souvenirs. Put your son in charge of finding the best deal on them!