There is also a Princess cruise that goes to Tahiti. I believe they make 4 or 5 stops in Hawaii and 3 in Tahiti. It is on the Tahitian Princess another non American flagged ship who must make a call at a non USA port during the cruise.
My husband and I were actually on an NCL Hawaiian islands only, cruise and the Tahitian Princess was in port on Kauai at the same time. (Wow two ships in one harbor is quite a site!) We had planed to take a flight while on Kauai. There was another couple that was shuttled over to the air port and flew with us, who were on the Tahitian Princess, they were at the tail end of the cruise and were telling us all about the ports of call and the great service. It actually sounded better than our NCL cruise. It is a 10 or 11 day cruise that sails twice a month I believe.
So now you have another option. Have fun in Hawaii. Aloha!