I've agreed to help do some trail work over the weekend of October 6-9 with the USFS in the Mokelumne Wilderness. This is in an isolated and rugged area, definitely not for beginners. But if you want to help drop me a message and I'll out you in contact with the ranger in charge...
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Check our our website: http://www.backpackthesierra.com/

Or just read a good mystery novel set in the Sierra; https://www.amazon.com/Danger-Falling-Rocks-Paul-Wagner/dp/0984884963