On my Cruise down the Croatian Coast, I visited Dubrovnik twice in one day. In the morning we toured the town and after a leisurely afternoon and dinner back on the MS Arion evening, I joined an optional excursion to a Dubrovnik theatre for a folk-lore evening with the Dalmation acapella singers and traditional dancers.
In the morning we entered by the Pile Gate and were led by our expert English speaking guide through the labyrinth of streets to visit the Franciscan and the Dominican Monastery, the Cathedral, the Rector's Palace, and St. Blaise's Church.
During our free time I climbed up to the city walls and took photographs of a beautifully restored city. (During the 1991 - 1997 war Dubrovnik was quite badly damaged) The evening theatre trip was delightful, as was walking through the streets in the warm evening whilst people watching and listening to the buskers.