Between the upcoming update and the holidays just past, there are a lot of new players on ACNH. I've had several newbies visit my island, and a lot have no way of knowing the community's expectations of visitors. So this is an educational list of good visitor manners.
Usual etiquette:
Don't chop, pick, or take anything without permission. This includes fruit trees, money trees, flowers, vegetables, glowing moss, items set out, etc.
Don't "leave quietly" - meaning, always leave through the airport and save at your own island before logging off. If you just leave by hitting the minus button, it messes up everyone's progress since the last autosave.
Ask permission before buying anything at shops, going fishing, or catching bugs. Most people are okay with that, but make sure you ask first.
Do not hang new designs in the clothing store without permission.
Don't litter. Don't drop anything the host didn't ask for, and don't leave stuff lying around their island unless they tell you to. This includes picked-up items like flowers.
Pay attention to the in-game chat and your messages on reddit. If the host wants you to leave so they can log off, or if they want to give/show you something, etc, you want to make sure you see their messages.
No running through/over flowers. That tramples the blooms. Walk only.
Experienced hosts, feel free to add anything I forgot in the comments.
