This place ranks No.1 in the Travel Destination category on Yahoo China almost everyday, and it is also one of the places that I really want to go personally.
Jiuzhaigou Valley, meaning "Valley of Nine Villages", is a natural reserve located in the northern part of Sichuan province. Declared a UNESCO World Heritage Site in 1992, it covers 240 km² and consists of broad-leaf forest and woodlands, mixed mountain and highland systems. It is particularly renowned for it's numerous colorful lakes. The water contains high concentration of calcium carbonate and possesses high degree of clarity and the most beautiful turquoise blue I have ever seen.
Five Flower Lake (http://en.wikipedia.org/wiki/Jiuzhaigou_Valley)
Strangely, it is not the No.1 destination for most foreigner visitors in China. Most of us will just go see things like the Great Wall or the Forbidden City when we go to China for the first time. I only learned about Jiuzhaigou Valley when I was watching the weather forecast on TV (you know how they show pictures of different touristy spots when doing the weather forecast) on one of the local channels. Guess it's because the location is not as accessible. As for myself, I will go one day when my fear for long-haul bus rides and public toilets is overcome.