How can i go from Beijing Gubei Water Town Yicheng Inn to the Ming Tombs?

Well, you can take a taxi to Simatai Great Wall Station first, which may take you 5 minutes.
Then take bus Mi51 and get off at Baocheng Gongsi, and you can see Baocheng Bus Station.
Take bus Jiao 80 from the station and get off at Wal-Mart, transfer to Bus Chang 67 and get off at Nanxin Village, you will see Ming Tombs. It takes about 4 hours.