Planning a short trip to Beijing from Sydney, Australia

Hi,

I have a 12hour hault at the Beijing airport and would like to be seing the places around. On googling online I have found out few famous places which are Great Wall, Forbidden City, Temple of Heaven, Summer Palace and Tiananmen Square.

Could you tell me what mode of transportation would be suitable from one place to another and among these places I might have to short list few places. Could you suggest the distance from the aiport to all these places approxiamately.