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By Jason Mark
Normally, a writer writes to reach an audience. But what I'm about to tell you, I want you to keep just between us, OK? Whatever you do, don't email this article to your friends, don't share it on Facebook, and please don't post it on Twitter. Because I'm going to let you in on one of the San Francisco Bay Area's best-kept backpacking secrets, and I want to keep it that way.