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I see that you have already got several ideas here, here are mine. First - boy as in son? We've been to the Natural History Museum several times. It's much more fun than it sounds. Even the escalator is great.(Not kidding.) The Science Museum. And St. Paul's. And New Tate Modern. I'm probably going there at the end of next week with my daughter, and she wants to revisit Camden Market, Tate Modern and Covent Garden. We'll also go the the Transport Museum (in Covent Garden) and the new Design or Architecture museum. To eat? We always go to Queensway (the street). There you can find food from all over the world, and not too expensive. Have a wonderful trip!