Last I heard, a pair of poke-heads walked themselves off of a 90ft cliff in Encinitas (near San Diego, CA). But, I think they survived. If it's the area I'm thinking of, it's not a straight drop, but more of a Pachinko machine ride to the bottom.
As far as geocachers goes, they're not as bad. But, they still tend to make some monumentally bad choices (like putting a cache in the middle of the shooting range).
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Hope for the best and prepare for the worst.
The object in life is not to be on the side of the majority, but to escape finding oneself in the ranks of the insane