On the whole - "ditto" to other reviews. Small bathrooms, good but not great food kept warm, service staff is wonderfully kind though not overtly helpful, etc...but here's some tips we thought once you've decided to go.
For the Ship - we found the 14th deck cabanas to be the single best deck spot on the ship! A semi-private area that can be staked out for the day if you're up early. Amazing spot for last Kauai day and Napali coast views. It is admittedly above the 11th deck pool action, but we valued that solitude more than the music and happenings.
For the Stateroom - It's not well advertised but beverage only orders are free room service with no service charge if ordered between 6 and 10am. Enjoy.