Two: hanging ketchup is much sweeter.
Three: Niuzhuang School: Of course, the most authentic one is Gaoxiaoshan's, which is a direct biography of Niuzhuang Town. There is Gaoxiaoshan Niuzhuang Pie on a small road near Xiguan in the city. I'm sure I can get there for 6 yuan.
Four: If there are small passengers, get to the station before taking the bus. Before you get on the bus, you should say hello to Dabei Temple. Haicheng also has the Great Compassion Ancient Temple. I haven't been there, but I heard that there is a little distance between the two temples.
Have a good time.