Was there about ten years ago. A difficult port to find a good place, many fences, busy traffic. Short harbour cruise give the best opportunities. Also the foot passengers bridges to the ferries were accessable at that time, standing higher at the Grimaldi ferry terminal gave a good view over the harbour. There is no accessable mole to see incoming/departing vessels as far as I know. It is wise to find out beforehand the timetables of the ferries and cruiseships. Other ships to be seen during my visit were a few laid-up tugs and a few tankers in the commercial outer harbour during the harbour cruise.