Hi Florian. Zip, Murray Hill is a delightful hike. It kind of reminds me of the Matterhorn at Disneyland--it's so conical it almost seems fake. There are picnic tables up there. There are wonderful views of 'the big mountains', i.e the San Jacintos. One year on 4th of July I hiked up there at night with a friend with the idea of watching the fireworks in the valley, but we were actually too high up, and could see nothing at all.
You mentioned the yellow bulldozer at the end of the Art Smith trail. Actually we would never want to remove it as it's kind of a treasured landmark for us locals. It is the remnant of 'crazy Mr. Dunn" for whom Dunn Road is named. Dunn was a local developer who during the 1960's got it into his head that the area behind Murray Hill would be perfect for a new development, so he started bulldozing a road straight toward it. He totally neglected to get landowner's permission or even discuss it with them, though. He basically thought, 'if I build it--i.e. a road--then I will get people to finance this thing and give me money to buy the land I'm meanwhile bulldozing my way across." Fortunately no one went along with him, and after a while, the scheme was abandoned, along with a couple of bulldozers. Actually, crazy Dunn was fairly prescient, as the flat valley behind Murray Hill would in fact be perfect for a development, and that's why the Sierra Club threw their weight behind the BLM proposed land swap with the AC tribe--because the tribe agreed to purchase this parcel and give it to the public in the swap. As some know I still don't think that makes it a good swap, but that's another post.
So anyway, I kind of like that crazy yellow bulldozer--because it's part of the history of these trails, including Dunn Road, which, while not leading to any kind of development, is excellent for mountain bikers. In fact, President George W. Bush mountain biked up here while he was in office. Always wondered how the secret service dealt with that.

Q: How many therapists does it take to screw in a light bulb? A: Only one, but the light bulb has to want to change ...