I know the most convenient way is to take a cross-border bus at Huanggang Port to Kwun Tong Station, then take a bus or taxi or walk to kwun tong ferry pier and take a boat to Kai Tak Pier.
The following are details of cross-boundary buses of Yongdong Bus. Other travel companies. ; Cross-border through trains can be learned by yourself, or you can visit Huanggang Port if you have a closer one. There are several shops that do cross-border trains nearby.
To kwun tong ferry pier Kai Tak Cruise Terminal, the 10-minute ticket is HK$ 6, which is flat and fast. But if it&;s not a holiday, it seems to be two shifts a day, and there are hourly shifts on Saturdays, Sundays and public holidays. If you can The ferry from Kwun Tong to Kai Tak Pier will not be accommodated, you We&;d better take a taxi. There is no direct bus in Kwun Tong subway.