To the left of the Welcome Building you will see a London Black Cab and the Cable Car. Jump in either one of them and you'll be on your way. Both the Cab and Cable Car will make stops on the way to its final destination The International Airport.
Just jump out at any station if you wish too. The Airport stop also has a return Cable Car available. When you ride the Cable car try using your camera to pan around. It makes good photo opportunities. Have Fun !