I am planning to hike and camp along the wall and Huanghuacheng looks like a good section.

1. The Wall doesn't open to the public at night, so a night hike may not work in this section;
2. There are farmhouses at the foot of the Wall. You can have meals there. You can find a barbeque area inside the scenic area. It is also a good choice to bring your own food and throw a grill party inside;
3. You can certainly not set your tent on the plank road, bridge, or the wall. Seen from the map on this page, the Sand Beach should be the best place to pitch a tent.

Ok, thanks for the information.