If you could squeeze in a few more days, going to the Galapagos would be worth it, especially around Wolf and Darwin Islands. You can see hammerheads, whale sharks, giant manta rays - the thing is that you need to be an experienced diver because of the cold and the strong currents. I went with Quasar Expeditions on their liveaboard schooner the Alta, and it was a vacation to top all vacations. If you go, get yourself a good underwater camera.
Just thought I'd pass on this nice video of China sightseeing highlights from the Video Sharing area of TRAVEL.com. I hope you enjoy it and sample some of the other videos online.
Likewise, if you have a YouTube video you like, we'd be glad to see it online in the Video Sharing Forums. This also means that you can embed videos into your blogs!