I'm not sure. I don't think so.
I have seen a drone flying off of the meadow along the catarac trail out of Muir Woods. I doubt the park would allow it during normal hours but you can go in early morning before the park is open (free of charge) and there will be no one there.
I'm not sure about the possibility to use a drone inside Muir Woods ... I'm quite sure I didn't see any Drone Fly Zone sign inside the forest and above all there are several signs that strictly invite you to keep silence in order to protect the fauna that lives inside there. I'd check The availability to do that whit a ranger or someone of the staff who works there.
yes
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