We had Room 10245, a Lido Deck interior with an upper berth.  Nothing unusual about the room and we had no noise or A/C problems.  I was stuck with the upper berth, of course, and since the beds were pushed together my climbing ladder had to be placed at the end of the bed, instead of the side where it's clearly intended.  I eventually got used to climing up and down by about Day 3 of our cruise.  Given a choice, however, I'll opt for a sofa-bed in the future.

This is Carnival's method of allowing passengers to purchase the perks normally offered to their senior loyalty cruisers (Diamond and Platinum).   It includes priority boarding, priority access to your cabin (no waiting until after 1 pm), priority tendering, priority line at Guest Services, and some other perks.  It worked very well for us, allowing us to bypass a long line at the cruise terminal and the long line at Guest Services.  Well worth the price, which is charged per cabin, not per-person.

Too much hassle from "shore salespeople" wanting to sell you everything from excursions to weed to hair-braiding.  We just went over to Margaritaville and paid our respects to the nearby statue of Bob Marley.

Ocho Rios

This was efficiently handled by the Shore Excursions staff and since early excursions also get you priority tendering at Grand Cayman, it's almost a no-brainer to book something if you don't otherwise have this perk.
The excursion was a short 3-minute walk from the pier, and after a safety briefing we were in the water towing our snuba float out to a nearby underwater wreck.  I was in a group with two other people sharing the air-tank in the float.  We snuba'd over the wreck, and then by a nearby reef.  Total time in the water was about 30 minutes although it seemed longer.  I'd do this again.  My only gripe is that I needed maybe one more weight in my weight-belt to be comfortably neutral-buoyant, but it's my fault for not asking for it right away.  
Otherwise, I liked the relatively laid-back, no-hassle atmosphere of Grand Cayman and would like to go back someday.

Due to reroutes from the Eastern Caribbean caused by Hurricane Maria, we were the seventh and last cruise ship to dock at Cozumel, making it very crowded indeed.  We decided to forego taking a cab to a no-doubt crowded beach and instead returned to the ship for lunch and Cheers drinks.  We went back to do some shopping during the afternoon when the port shops were least busy, so returning back through security wasn't too much of a wait.  They don't hassle you as much as they do at Ocho Rios (or, say, Nassau or Labadee), but the shops by the Puerta Maya pier were very crowded early during our visit.  It got better later.

Cozumel

The SkyRide had to be shut down on the last two days because of high winds and the Serenity area in front was also closed, along with some of the doors leading out to the Lanai on Deck 5.One bright spot:  the Engineering Control Room was very advanced and modern, as you'd expect on a new-build, with hi-def flat screen displays on the walls and a "tactical table" consisting of a BIG horizontal flat-screen touch display the Second Engineer used to show us all sorts of details, including what actually comes out of that whale-tail funnel, and a live camera shot of one of the ship's two rotating azipods (main propulsion motors) running underwater.

Carnival Vista Review

Carnival Vista -- some good things, and some bad...still a fun time, thoiugh

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