Your cruise is half day tour only~? Chances are that you will join those PRC tourists~ Best spend 2D1N cruise to enjoy the experience~ take their bus from old quarter and go direct to their cruise berthing area~ their harbour is not just one departing station, every cruise dock at the difference area~
The highlighted area is the harbour for the cruise~ it's better to email or Whatsapp to the operator the actual location, rather you go there and find your own cos their English language is very limited~