There are no casinos on the ships based in Hawaii. If you're doing one from the west coast (14 - 15 day) there will be a casing but it's not allowed by State law within so many miles of the islands, I think 50 miles.
You'll have very little time to spend in the casinos as they sail at night between ports and with the mileage regs there is not much time you're outside that zone.
Thanks for the quick answer. Does that apply to all cruise lines? We were actually looking at a Celebrity cruise throughout the Islands (11 days) and I thought the Casino could keep my husband entertained.
We cruised on the NCL Wind from Hawaii to Ensanada. I knew there would be no casino action while in the Hawaiian Islands but I thought it would be open during the 7 day cruise back to the mainland. I was wrong. The casino was actually dismantled and used for the art auction and yoga classes. For the Alaskan cruise the casino was put back in. Oh well, I saved money!
Maybe it's because I live 75 miles from South Lake Tahoe, and did some gambling in my younger days (professionally), but on the 164 cruises I've been on, (oh, I mean 8), I've spent maybe a combined 36 minutes in the casino, and that includes the 7 minutes I spent walking through the casino to get to another part of the ship. Very curious to me.