One of our neighbors does Air BnB. Fortunately -- so far! -- no issues. Well, we've had to tell people to move their cars, as they are parking in the communal driveway. And one time, a wedding party told their guest that they could camp there instead of paying the campground fee. Except they were on our land.I just lock everything up, and frankly, it's not the Air B'n'B people I worry about. It is the fact that we now have people coming and going all the time and I no longer have a clue who some of them are.
The neighbor was very apologetic, and said that wouldn't happen again, but if it did, they could tell the offenders in no uncertain terms to move. They didn't leave any mess, so it was ok.
This neighbor is VERY protective of the group privacy we all share. One time a friend of mine came back to get some comfrey leaves. That neighbor saw him drive by and go to my house. He called to make sure I was ok...

To tie this back to gardening, the comfrey leaves were to deter wire worms from his potatoes. It didn't work, unfortunately...