Pay attention to black cars when traveling to Beihai. There are many such soliciting personnel in trains, docks and airports. They will give you a ride in their car for various reasons, and then recommend you cheap hotels and book cheap tickets for scenic spots. Others will have you as a fellow villager, reducing your awareness of prevention. I'll kill you if I don't see you. In addition, it is recommended to go to the market to buy food and then find a place to process it.