Actually, one could spend a month on the Oasis and never see the ocean. It really is a floating city, to the extent that you rarely realize you are on a ship. One should view the video on the Oasis construction to really appreciate the design and assembly of these monsters.
We had one of the "Inside Balcony" cabins, overlooking "Central Park". Don't bother. Since there is nothing to look out on except a few trees and a few folks strolling along the sidewalks, it becomes boring after about 3 minutes. And, the view never changes! The cabin appointments were OK but the cabin itself was a little small, compared to other ships we have sailed on.
The Shows are, for the most part, terrific, almost Broadway quality. However, the methodology for getting in to the shows, making reservations, standing in line for everything, not knowing were to line up for standby makes the entire process terrible. RCCL needs more signage and a better method for show access. While, in the end, everything seemed to work out OK, all the show entrance processes are a mess.
Cabin fine, a little small and the "Inside" balcony a complete waste.