@Wayne Kerr, @koeklin: Great finds! (How do you do this? You PAUSE the game?? )
The mountain with the hikers is Mt. Chiliad. I still have to make it to the exact same spot, so there's no photo yet, but if you find Dignity Village (north of Chiliad, easy to miss, but it's on the map) and look up, you can see where it must be: up south from there, looking southwest.
Don't laugh, but I actually take a photo of the TV screen.
My kids normally get on the PS3 when they get home from school, so during the day I drove around Chumash & took a photo of all the houses & buildings in the area.
That way I can still locate things while they are playing.
I was sitting on the coffee table yesterday with the controller in one hand & a camera in the other, just snapping away.
My wife walked in, took one look at what I was doing, then shook her head in disgust, mumbled something about being obsessed, then walked out.
The sad part is, when my kids went to bed, I still continued to look for more houses rather than actually play the game.