Originally Posted by Kuki
A passport is not necessary, but you will need a birth certificate and driver's license or photo ID.
In fact since it is an intrastate trip no birth certificate either. Government ID like a drivers license just like a domestic flight is all you need, unless you are going to one of a few Fanning island cruises on the POAL.
Inter-island Cruising. There's no need for a passport when you sail on any NCL America inter-island cruise. So if your ship never sails beyond the islands of Hawaii, all you need is a government-issued photo I.D. or a valid driver's license with a photo.
Fanning Island Itineraries. If your particular cruise calls on Fanning Island in the Republic of Kiribati, you are leaving the United States and a valid passport is required.