On the 11th of August my boyfriend and I will arrive in Beijing Capital Airport by plain at 6.40 am.

And will leave again the next day at 1.20 am so we have a whole day to spend in PEK. We would like to visit the Great Wall and the Forbidden City.
We would like to know how we can get from the airport to the Great Wall in Badaling, then from Badaling to the city centre, and finally from the city centre to the airport again. It's hard to find correct information.

Thank you so much for helping us out!