The afternoon sun can fry you on the water! I got fried! Even alot of the locals use and umbrella. The boat that I hired had umbrellas to use but I didn't open it until it was to late. Sunblock could be quite useful too. Most boat rides take 10-11 hours on the lake so you know how the sun can reflect off the water.
The kids are so cute that you will want to use up all of your film taking pictures of them!! Sorry not a dangerous warning. Nothing in Nampan look to dangerous. Maybe be careful getting out your boat if you come by boat.
That prop is not protected. Simple enough but if your balance isn't that great don't stand up while the boat is moving.
Be careful if you are sitting in the last seat closest to the engine as there aren't any safety covers on the flywheel and belts! So if you trip and fell into the engine it would be quite a mess!!