Classmate, you may be mistaken. Starting from Shanhaiguan, you go to Yanda first and then Beidaihe, so you have to go through Beidaihe and don't know how to get there. However, you can put down your luggage and go to Beidaihe. From Shanhaiguan Railway Station, you can take bus No.25 to Sidaoqiao Bus Station, and then take bus No.6, No.32 and No.34 to get off at Yanshan University. I just got back from Qinhuangdao, where buses in suburban counties, such as bus No.25, can arrive at 7: 30 at the latest, and buses in urban areas are even later.