Uphill would more than likely be the direction to go as downhill there are several residences that take up a large chunk of that land. IMO there are WAY too many places he could have driven along that highway, pulled off the side of the road (without anyone driving by him for a while) and thrown anything over the side of one of those railings never to be seen again. Whenever I make that drive my skin starts to crawl a little thinking about the history there, both known and unknown!
When you take that drive over the Ortegas, be aware if you start thinking of Amber or a crime in any particular area. See what comes to you if you do.
I was telling The Mentalist about repeatedly thinking about Polly Klaas as I'd pass by a particular section of 101. This was while her body was undiscovered. I'd hear what I perceived to be her voice, screaming, and in anguish. This went on for several times as I'd pass back and forth to the San Francisco area.
Why that had happened became clear when they found Polly's body just off the freeway at the south end of Cloverdale.
What I'm saying is there may be psychic information to be picked up.