First time ever on Oasis; had always avoided it because of the numbers. Was very pleasantly surprised that it never felt crowded. Never had a problem finding chairs on the pool deck or Solarium. I can't say the same for the smaller ships; just try to find two chairs together in the solarium on Serenade or Brilliance.
The promenade on the smaller ships is shoulder to shoulder for the 70's show.....not on the Oasis, no pushing and bumping into each other. You could actually walk the length if you desired.
Best laid out cabin we have been on in over 40 cruises with Royal and Celebrity. We weren't bumping into each other while getting dressed for the evening events. Bathroom was larger as was the shower.
Embarkation was fast, less than 30 minutes start to finish.
Went by taxi to Nachi Cocum. Very enjoyable (been there before).
Just walked around the shopping area. Nice that it is secure from outsiders, new, and clean.