Be a good neighbor. If you are playing music, most new campers have outdoor speakers, ask your neighbor if it is too loud. If they say yes, turn it down.
Leash rules. Just because your dog is friendly doesn't mean the dog being walked down the road is friendly with other dogs. If your friendly dog gets into a fight while not on a leash and somebody gets bit while separating the dogs, guess who is responsible for the doctor bills.
If you see someone struggling, offer to help. Our last two trips out I made a difference in somebody's weekend enjoyment. First trip, two ladies with two kids and a pop-up. She could not back the trailer more than 10 feet without pulling forward again. She was getting further from the campsite every time. I asked if if I could give some verbal help while she learned to back up. In a short time the camper was in the site.
Second trip was a state park with limited electric sites. We had the last site with electric. Our neighbor without electric had a not so quiet generator to run during the day to charge the batteries for night use. I suggested he run an extension cord to my post. The posts had 50/30/20 amp breakers in them. I was using the 50 amp. The next day it was headed for the 90's and I heard them talking about wanting to go fishing but couldn't leave the dog in the trailer. I remembered I had a 30 amp extension cord and offered it up. They had comfort with Air conditioning for the next two days and none of us around them had to listen to the generator.