Hi Tina

Welcome! Glad to have you join our little group. I have to say that with a sore knee, Half Dome has to be just about the worst hike you could take. If you're interested in other options, let us know. We have lots of ideas and experience here.
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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