I will admit, that first impressions of Nachi Cocom aren't flashy. You take a taxi there, passing all the other beaches that you've read about (if you've researched the port at all), and the taxi pulls up at a little gate where they buzz you in. You don't see much when the taxi drops you off, and the first thing you do see is the lady with the sombreros who wants you to wear one and have your picture taken. By this point, you're probably thinking "did I make the right decision?" Then you proceed in to the register where they collect the rest of your money (in cash), and you feel a bit better because they had your name on the list. They then take you to your seats for the day, and your waiter runs over, introduces himself, and takes your first drink order.
Once you sit down and look around, we were very happy to find the beach uncrowded, but wondered if it would fill up later in the day. It didn't. Then we headed out into the ocean, and enjoyed the water, and the gentle surf that wasn't too strong for the kids. We used a float in the water and on the beach, the kids played in the sand with the sand toys we brought, and everyone had a great morning. Our lunch was great, and after lunch we took advantage of the pool which was one of my favorite parts. Once on the beach, or in the pool, our first impressions were greatly overshadowed by how beautiful it was and how much we all enjoyed ourselves.
We did pay to rent a float, and we did purchase the picture, and we did tip our waiter. But we still paid less than we would have with
DCL for a much more crowded experience without the beverages and the pool.
We have been to Nachi Cocom twice now...and it is definitely my crews favorite port/beach stop. 
As far as drinks...we ordered a bunch of mixed drinks and they were not watered down...could have been a different bartender than the PP had...also you can ask for a double shot in the drink...Funny thing...I asked if they had the wine coolers Smirnoff Ice...and the waiter said yes...he came back with their usual clear plastic cup full of a clear liquid. I didn't think twice about it...because the wine coolers are clear in color...took a drink...and yep...it was pure Smirnoff Vodka on Ice! 
We got a good laugh out of it! IMO...they are not skimpy on the use of the alcohol. Anyhow...we love it at Nachi Cocom! Oh, and as far as the ocean and the drop off...keep in mind...it all depends on the ocean...the entry into the water is always changing. When we were there the first time...it had a drop off...the second time...you could walk a long way out. It just all depends...
Crystal
Apparently they got into doing shots...and all that I could see was my conservative father-in-law...coming down the cabin hallway on the ship...knocking on everyone's door and shouting "Merry Christmas!" No lack of alcohol there! 
