Dear Lorie,
Thanks for contacting Top China Travel!
Definately we can add a Hongkong tour into 11days Chian Tour, and could you tell me more information of your trip:
1. When do you plan to go?
2. How long would you plan to stay in Hongkong?
3. Which kinds of hotel do you like?
Any further request or question, please feel free to contact with us.