Answered by Michael from Denmark | Apr. 12, 2018 22:41
To Badaling: Take metro line 2 from Jianguomen to Jishuitan Station, Exit B2. Then walk to Deshengmen Bus Stop and take bus no.877. Bus no.877 takes about an hour and costing CNY 12 per person. The drop-off site is close to the pulley car lower station and about 10 minutes' walk to the entrance.
To Mutianyu: Take metro line 2 from Jianguomen to Dongzhimen Station. Then you can take bus line 916 Express to Huairou North Avenue (Huairou Beidajie) Station. It costs CNY 12 and takes 60-70 minutes. Then, transfer to bus line h23, h24, h35, or h36 to Mutianyu Roundabout. Afterwards, walk about 450 meters to the ticket office of the scenic area.