Tip #8 No selfies or any other photography.
Tip #9 No staring. Looking is natural, staring is rude.
They also ask their readers to participate in a short survey with one question:
Have you ever gone nude on vacation? Choose one response: Yes, I'd do it again! Yes, but it really wasn't for me. No, but I'd like to. No, and I would never want to. Go ahead, take the survey and see how your answer stacks up.