Can anybody share any nice place to tour in Guangdong for 6 days from Guangzhou. thanks

For your six-day tour in the province, here is my personal suggestion:
Guangzhou - Shenzhen - Zhuhai
There are many high speed trains between Guangzhou and Shenzhen. To Zhuhai, there are many buses in operating.
If you have time left, go to Foshan for fun, which is connected with Guangzhou by metro.

Thanks for your info April.