The Carnival Sunshine is a make-over of the Carnival Destiny. I am Platinum card holder with Carnival and have sailed on the Destiny in the past. Here are some pros & cons of the make-over.
Pros - Sports Deck (waterslides and kid's fun area) and serenity decks. Cons are: old lounge area for the Punchliner was converted into rooms, forcing lots of people into the smaller Limelight lounge, narrow passageways near Guy's Burger Joint and Blue Iguana Cantina, and removal of passageway on Deck 5 that bypassed the casino.
Some other problems were people smoking on their balconies, standing water on our balcony, too much smoke in the casino and on deck 5. Several cruises I have been on have casino hours for non-smokers. But the ventilation system is inadequate for the amount of smokers in the casino. I also noticed quite a bit of corrosion/rust at the aft exterior of the ship.
Standing water on balcony, cabin steward was great!