We came to the port by coach and we followed the road from the airport in front of the cathedral and past the marina on the left hand side. There seemed to be one main harbour for the ships. I would have thought it was straight forward to find. After you have left your cabin by 8.am there is not a lot to don all on borad shops ,bars etc shut. I do know that there is a free sightseeing trip available and then you can be dropped at the airport or get a taxi elsewhere.
The cruise ship berths are very visible from the main road which runs around the marina...opposite end from the cathedral.
Thanks - it appears to be that the ship docks at the Club De Mar and not the Club Nautico but that is what I am not sure about and hence the question I asked .