Nice town, take the Flobanen to the top of the mountain for a magnificent view.
Bryggen is nice too, old wooden houses etc. For lunch : eat fresh fish at the fish market.
Top city in Holland, forget amsterdamn ! Rotterdam is modern, has wonderful museums ( Boymans, Wereldmuseum, Maritime Museum), great shopping ( Lijnbaan, Koopgoot)and it only takes a 10 minute walk from the ship.