This was our first cruise and first trip to Hawaii. NCL went out of their way to make it special for our parent's 60th anniversary. Tips I would suggest for this trip:
1)Stay in a suite with another couple if possible. We received many perks for being in a suite, and our cost was cheaper per couple than the other two couples who travelled with us. The room was spacious, quiet, and clean. We were in the middle of the boat--not above a party room that played booming music like the others in our group!
2) We rented cars on Maui and Kauai, and that was a smart option. We did as we wanted, and we parked them overnight so we could have them both days. DO NOT go with Dollar as they were expensive and not helpful (we did this on Maui). Enterprise was much more reasonable and helpful (we did this on Kauai). We made reservations beforehand with Dollar, but it was just as easy to catch the rental car shuttle off of the boat in Kauai, and they had plenty of cars.
Clean and spacious. Our steward was courteous and helpful, but we did not use her much. Two families with two children each could easily stay in this room!