I believe the island you are referring to is Cayo Largo. We went there a few years back (6 or 7) and stayed at what was the Sol Pelicano. The other hotel with a nude section was Sol Cayo Largo. Nudity was only permitted on a marked off section of the beach at each hotel. We did visit friends at Sol Cayo Largo which seemed a little more upscale than Sol Pelicano. It’s Cuba, don’t expect high end food, but the food is OK. There is usually a shortage of something, like lettuce or tomatoes. You can do some excursions off the resort either by bus or a small train. There is the marina and a small town, with a bar, a souvenir shop and a bowling alley. There is also a small aquarium where they raise sea turtles. The town is where the hotel workers stay…they are usually on 30 day rotation…when the ferry is running! No one lives on the island full time. Crime is pretty much non existent.
Except for a Cuban band that wanders around the resort in the evening the entertainment is largely like an elementary school talent show (at least when we were there).
Hope this helps.
John