Originally Posted by catflyer

I agree, don't take a taxi.

Check out Simon Xiao (http://simon-service.com). Describe your whole itinerary, he'll quote you an exact amount up front, no bargaining needed. He'll take care of tolls, parking, show you exactly where to go, watch your luggage/etc. while you are on the wall. Loan you his spare phone with the "call Simon" button and help you navigate Beijing with his excellent English.

He'll meet you at the airport with a sign with your name and maximize your time for touring.