Tbambard, you are going to have a GREAT trip.
We went this past June. As mentioned by Jimbo_Boston mentioned, it is an older ship, but it has been "overhauled" and is a very nice ship.
The staff were great. If Rodney Soloman is still working on her, he will make your cruise fantastic. Anything you need, he's your man. If you see him, tell him Gayle and Amy said hello. My DW wanted to take him home with us.
We cruised and visited the islands, and only saw a sprinkle on Hilo.
They do offer a luau (we went to it) and it was good intertainment, but the better luau is THE Old Lahaina Luau. Make reservations in advance.
The temp. was great. The hottest day, it reached 87deg. Most days were in the mid 70's.
Weather permitting, on your your cruise between Hilo and Kona, the Captain will cruise by the only volcano in the islands that flows into the ocean.
Pride of Aloha - June 2006