Also, I now leave a bottle of that indoor/outdoor safe-for-kids-and-pets insect spray that's supposed to stop bugs for months but usually needs more frequent applications, and tell them they can spray around the perimeter if they want to when it starts getting warm outside and the bugs start showing up and that it should last them all season.  

They were thrilled to have him and not deal with copperhead snakes infesting the outdoor space near the house.  

I want to mention from your last posting if it has no outdoor storage you want to think about where they put the lawn mower, bikes etc. 

I have now written into my lease that you make smoke outdoors only.

I'll contribute $ 10 for each night stay in each unit to the community and every 3 month I'll let them vote on what they want the money to be used for: outdoor pingpong table, whatever.

 :)Another reason...if I were a single parent, with a smallish child, it would be great to have even a small, secure outdoor space my child could go out into, without me having to have eyes on them every second.Both of those things are reason enough for me to forgo an apartment.  

They even work with us where, for example, on one turnover last year we came in town and did what we wanted (pressure washed house, painted outdoor trim, stained decks, fixed fence, etc.), then they finished it up when we were done.  

All of the yard and outdoor maintenance is done.

-slap some outdoor oil-based paint on it, but wait until the 2nd or 3rd time they mention it; again, the tenant accepted the property the way it was.Replace a leaky garden hose.

They might need to be segregated out by problem type with some people offered solutions and some people FORCED into solutions.There are also Hobo types that want to live outdoors and beg (by choice).So maybe looking at this as several mini-problems all under one umbrella that need solving might help.Good Luck!