Answered by Bruce | Jan. 15, 2016 23:11
What do you mean by "Free"? If you want something cheap, you can travel on your own and it's not difficult. From airport, you can take express train to Dongzhimen, then change to subway lines to the scenic areas like Tiananmen Square, Summer Palace...
Tiananmen area is recommended. There are Forbidden City for sightseeing, Qianmen for local snack, adn nearby Wangfujing for shopping.