Tourist Visa at Guangzhou Pier

I am a HK permanent resident card holder after 25 years working in Hong and my wife and I, both New Zealanders now live in NewZealand.
We will be passing through Hong Kong CLK airport from Europe and wonder if we can catch the CLK to Guangzhou ferry or Jetfoil and get a Chinese Visa at Guangzhou pier. One of our HK born sons now works in Guangzhou and we.would like to visit him. Thank you in advance.for.your thoughts. Russ