Hi, I want to go for holiday with my family, and I'll be going to Hong Kong first and then mainland.

There are a few things that we want to enquire:
1. Are there other cities in mianland that allow Visa exemption as in Sanya? How about guangzhou?
Can we apply in Hong Kong?

2. How much is the cost of application there and How long the validity is?

3. What are the documents required and how long is the process to get it?

Please kindly advise on the above enquiries. Thank you so much in advance. :)