There's really no big mystery to 'proper' nude behaviour. It's mostly common sense and consideration for others. But there are a few pointers that might be handy for newcomers. These pretty much apply both at beaches and other nudist venues.
- Nudity is not sexual. Sensual? Sure, but keep the sex where it belongs. Contrary to some common perceptions, most nudist gatherings are not meet markets.
- Don't stare, looking's ok.
- Bring a towel to sit on. Nudists tend to be the cleanest people you'll ever meet, but still...
- Stick with first names until you know someone well enough to share more. Privacy is a big issue with many folks.
- Do not take pictures without permission from everyone present. Many places prohibit any kind of recording device. If not sure, keep it stowed.
- Applying tanning oil to yourself or another is fine, just don't enjoy it too much.
- Erections happen, but rarely. That towel comes in handy until things calm down.
- Glass is not nudist-friendly, and illegal at the beach.
- Don't stick cig butts in the sand. They come back up and are disgusting.
- At most places, newbies aren't expected to be nude immediately, but after a while your motives for being there may be questioned. Mazo Beach is an exception. While full nudity is the norm, many folks wear swimsuits for a variety of reasons. Besides, it's a public beach. But gawkers are not appreciated.