Regarding the yard issue:
We had a problem for a while with the gaggle of teens that seemed to be across the street, to the point that they were partying and trash was everywhere. Essentially we did nothing, but eventually things took their own course with the kids, and someone did call the cops on them.
As teens are wont to do, they've grown up since and are relatively quiet and reasonable people, but it was awful for a while. Hearing the sounds of puke in the dark hours of the morning isn't good either...
