Lovely town, we did it on our own and it is a easy walk into the centre of town.
We took the finicula up the mountain for views of the city. Then walked down the mall, went to the fish market on the wharf and walked through town to see a lovely fountain. Unfortunately it was raining so we then headed back though a fort back to the ship for a late lunch.
Would have spent more time in town if the weather was better.