Good advice for a first time cruiser is to stick with the ships tours unless where you are headed is close enough to the ship that you can easily walk or taxi back. Not a good idea to go wandering off alone in a foreign country until you get a little experience. If you are on a ships tour the ship will not leave until the tour returns. If you are out on your own they are not obligated to wait for you.
56 Carnival: Mardi Gras, Ecstasy X2, Fascination X6, Celebration, Elation X5, Glory X5, Fantasy X4, Valor, Holiday X3, Imagination, Liberty, Spirit X2, Freedom, Destiny X2, Splendor X2, Dream X2, Conquest, Legend X3, Victory, Sensation, Paradise, Inspiration, Magic X2, Triumph, Miracle X2, Breeze, Sunshine X3
7 Norwegian: Sky, Jewel, Dawn, Epic, Pearl, Breakaway, Getaway
7 Windjammer: S/V Legacy X3, S/V Polynesia, S/V Caledonia, S/V Diamant, S/V Sagitta