If you have a passport and a Hong Kong and Macau pass, but no visa, you can theoretically go to Hong Kong and Macau. The Hong Kong and Macau Pass itself is a travel document for Hong Kong and Macao. You only need to hold the pass to enter the country within the validity period of the pass. However, the specific situation needs to be determined based on the latest policy regulations and actual customs clearance conditions. It is recommended to check the latest entry policies and requirements before traveling.