Diving on mainland China

I'm going on a trip to China in August. It's not a diving trip, but I would
like to see if I can do a dive or two while I'm there.

So far, the only places in China I can find any dive centers at all are
Shanghai, Hong Kong and the island Hainan. Which are all places I won't be
going (apart from one day in Hong Kong, on which I doubt I'll have enough
time to find a dive shop and book a dive for the same day).

Places I will be visiting are Beijing, Xi'an, Chengdu, Kunming, Lijang, and
Yangshuo (yes, I will still enjoy this trip without doing any diving :).

Anybody know if there's any diving in any of these places?

Many thanks,
Michiel