I wouldn't change much. My ship would have only one floor of oceanview rooms and the rest would be balcony rooms. The main pool on the Lido deck would be larger. There would be a fully stocked convenience store with reasonable prices so I don't have to bring all of that stuff 'just in case.' Mini-refrigerators in each room.
In case of rain, the Lido deck and the one above it would have a retractable roof, just over the top, not enclosing the sides, so you could still see out and get fresh air.