If you ever want to live somewhere in SL or make business, better choose a region with a tight covenant on it. While standard "anything goes"-attitude on most parts of the mainland first sounds like real fun, it can for sure fast enough turn otherwise.
And now I've got a very good example for the necessity on a good, tight covenant. A friend of mine lives on the new continent in the east of the old mainland in the mature rated region Carrion that's without covenant at all. They're having a business there, but she lives there, too. It's been mostly a nice, quiet sim. Until some days ago a new neighbor showed up in the region. This new neighbor's business was making signs, he had a big enough parcel to upset the whole sim.
First he made his building very high compared to the other building, second he put some animated signs on his building and third he put some naked penises at display, too. This caused him an abuse report, the building is not there anymore, so this time it went good for the other parcel owners in the sim. But if he would have been a little bit more clever, his building would still be there.
Well, to take a look at how it was, just click on the two thumbnails here to see two screenshots of this now gone building, the mature content has been edited out, by the way. Ah, and yes, the mountain was an instant countermeasure from the neighbors to cover up this butt-ugly building and hide it. It's fascinating how one wrong building can ruin the whole region!