Hi. Which of the two is the best option?

Take Bus 916 to HuaiRou leaves from DongZhiMen every 10 to 15 minutes. Once you arrive in Huairou, ask to get out at BeiDaJie.

From Bei Da Jie you have 2 options:

1) Take a taxi to Mutianyu. Ask the driver to take you to Xiaoyuan (better to say Xiaoyuar with an r). A one-way trip with a private taxi should cost no more than RMB
60.

2) Cross the street and take bus 916 to DongTai which goes to the Mutianyu Roundabout . From there you will walk north up a hill to get to Mutianyu Great Wall. The Schoolhouse is on your right after approximately 2 kilometers.