Hi,sorry, I couldn't find any jade factory near to those scenic spots. I suggest you to buy jade at Beijing Curio City which is at 21, South 3rd East Ring Road, Chaoyang District.

You may distinguish the original jade and fake jade like this:
1.Check for coolness. Hold the piece in you hand. Even in a warm environment, jade should feel cool to the touch. If you are unsure, clasp the jade piece in your closed hand until it has warmed to approximately the same temperature as your body. Then set the jade aside for 30 seconds. Touch it with the tip of your tongue. Real jade does not retain heat well and should feel very cool.
2.Listen to the pieces. Hold one jade bangle loosely in each hand. Bump them into each other. If the bangles are genuine jade, they will produce a lovely, chime like tone. Real jade pieces produce a sound with a slightly higher resonance than pieces made of plastic or glass, while fakes sound like marbles rattling in a jar or glasses clinking together in a toast.