The Old City Harbor of Dubrovnik (Porat) is a very active area of the town, where many people go either for getting on boats to the near islands or to just relax watching the horizon and listening to the waves crashing on the rocks.
I like this place especially during the evenings: there is an area just on the outer side of the city walls that isn’t as illuminated by the lights as the rest of the harbor, from there it is possible to gaze to hundreds stars. I am always fascinated by stars and in big cities it is almost impossible to find places from where they are visible.