I know exactly what you mean, in my hometown (Dayton, Ohio) we used to explore the trails and footpaths through the woods and such.. It can be pretty ghetto! I remember the woods behind my grandmother's house had some awesome trails, but there were beer cans, broken bottles and even rusted out car parts all over the place. A far cry from out here.

The honest truth though, is that the reason for the cleanliness is because this is in one of the richest areas of LA. They really keep things nice around these trails. I don't think it would look like this if the paths were in Hawthorne or Compton.