I had these same questions before we visited in February. What we found was that there was a pretty wide range of attire for dinner, but the vast majority of couples were wearing shorts and shirt on the men and a dress, shorts or coverups on the ladies. There were very few that were nude at dinner, or even topless. Most wore clothing that could pass at any tropical resort. My wife wore sheer coverups with some structure and fit right in, I wore shorts and a light resort style shirt.

There is a list of the theme nights on the N website, but we found very few that dressed in accordance with the themes. For breakfast and lunch, towels, wraps, bathrobes or nude was the norm.