I am Canadian passport holder. Stopover in Guangzhou for 72 hours. Can I visit Macau ?

After you stop in Guangzhou, you can go to Macau for a visit and you can still enjoy the free transit in Guangzhou because when speaking of the transit policy, Macau is regarded as a third region. So your travel route will be Canada – Guangzhou – Macau – Guangzhou – your final destination. As long as your layover time for both of your transits in Guangzhou is less than 72 hours, you can enjoy the 72 hour free transit there. Nice trip!