Visa requirement to visit Hong Kong, Macao and Shen Zhen for Brunei Citizen.

Hi I am a Brunei Darussalam Citizen. I am intending to visit Hong Kong for roughly 3 weeks as she is currently working in Hong Kong. However, within that 3 weeks duration in Hong Kong, I am also planning to visit Macao and Shen Zhen for few days. Do I need to apply for any entry permit for the entry and re-entry of Hong Kong, and as well for Macao and Shen Zhen? Please kindly advice.