They have now posted a sign between the lower and upper parking lots that "No Hiking is allowed beyond this point". I didn't see that sign until after I had hiked but others may want to be aware of this restriction.
"After the first glass, you see things as you wish they were. After the second, you see things as they are not. Finally, you see things as they really are, which is the most horrible thing in the world."
--Oscar Wilde on Absinthe