Visiting HK on China Transit Visa

Actually, you cannot visit Hong Kong in the way you have presented. When you travel via Guangzhou you will be allowed to exit the airport and to visit the city and to have an overnight there, but you cannot visit Hong Kong because for something like this, you would need to have a layover in Guangzhou longer than 24 hours or to be precise you would have need to be eligible for 144 hour visa free transit. Even then, you would have to take a ferry from Shekou port in Shenzhen and return to Guangzhou from Hong Kong by plane. As you can see, this plan is impossible to accomplish because of several factors, so I recommend you just to focus on Guangzhou... One more detail... In order to be allowed to exit the airport in Guangzhou, you will apply for a temporary entry permit at transit counter. Here you will present your flight tickets as well as your hotel booking confirmation. This application is for free and the permit will be granted to you.