I want to be an au pair in China for a year. I have a Chinese family that want me to come over, and I've sorted out insurance/ flight costs/ etc, but I dont really know if that counts as work in a traditional sense. I'm being paid "pocket money" really, and even though I'm a native English speaker, I've not been to Uni yet (this is my Gap year project!) so I'm not a specialist yet...

Do I go on a tourist visa, or a work Z, and how would I justify my choice if I'm questioned by an authority?