I didn't know when booking that it was 50th anniversary cruise. It was nicely done. Each night presents were left, a beach towel, small blanket, hat, hairspray (used in onboard show Hairspray), etc. The last night they had fireworks.
CocoCay is very nice. I didn't go the waterpark. Several nice beaches, pool.
The ship is similar to all oasis class. A few added extras such as the 10 story ultimate abyss dry slide, which was too scary for me. Never felt crowded, always able to find a chair near any pool.
The water show Hiro was excellent. Very professional. I had an expanded inside cabin and it was plenty big, even had a couch. Staff was great. An excellent ship and trip.