This problem came up a short while ago, with a pilot wanting to land on the quay at Liverpool Docks for loading to a ro/ro ship. Zeebrugge, like all big European ports are usually very busy places. As a long serving shipping man, I can assure you that there are any number of things normally on a quayside, or on a nearby ship, that can be blown around or moved by the helicopter downwash, to the danger of all in the area and to the helicopter. It's really very much not a case of start the engine and go. The harbourmaster, if inclined to allow it at all, will have to make very sure that everyone is aware and away from the area, and anything at all moveable is clear or lashed down. This is before you get clearance to fly out of the area. In my view, loading to a truck for a short distance to a licenced helipad or airport would be a far easier and safer option.