GUANGZHOU TO HONGKONG A/R VISA OR NOT VISA ?

Christian, since you are a French citizens you have to understand that you can enter/exit/stay/explore China absolutely visa free for a period of up to 15 days. In other words, you should just fill out an arrival card that will be dispensed on board of the plane before landing in Guangzhou where you will tick transit purpose. When you land you will just proceed to the immigration with your passport and the filled out arrival card. After a short check, you will exit the airport and you are free to explore the city or to take a high speed train to Hong Kong West Kowloon station. Also, you will easily return from Hong Kong, using again West Kowloon train station to Guangzhou. You will again fill out an arrival card before your departure from Hong Kong back to Guangzhou because your first arrival card will expire when you exit mainland China. You should just take care to plan your day trip carefully in order not to lose your connecting flight to Bali. Have a nice journey.

Thank you very much for your response and your detailed and precise information. It's appreciable. Yours sincerely