You might check with the park...most National Parks have a few days throughout the year that are free.

Right now in California it is raining cats and dogs. Not a lot of fun in the mountains until this thing settles down!

But we are grateful for the rain!
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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