If my memory serves me well, you catch the ferry from either the Shun Tak on Hong Kong Island, or from the China Ferry Terminal in Kowloon. How often does the ferry run? From Shun Tak on Hong Kong Island they run every 15 minutes, while in Kowloon they run every 30 minutes. Either way, it costs around $20 (160 Hong Kong dollar) and takes under two hours from both places to Macau, though it depends on sea conditions and the boat used.