What is the best way of visiting ming tombs after finishing the great wall?

You can take bus no.879 to the Ming Tombs from Badaling. The terminal of this bus is at the tourist center of the Ming Tombs. It is very convenient.

For all I know, the sacred way is not very close to the dingling tomb. There is a bus Chang 67 running between the two spots. You can take it. And it is around 20min walking distance between Dingling and Changling.