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.
8 Norwegian: Sky, Jewel, Dawn, Epic, Pearl, Breakaway, Getaway, Escape
10 Windjammer: S/V Legacy X3, S/V Polynesia, S/V Caledonia, S/V Diamant, S/V Sagitta X2 S/V Mandalay, S/V Vela