Hazelnut Trail in San Pedro Valley Park, Pacifica. $6 vehicle fee. Currently one way so very socially distanced.
I did fit in a whinge about Android usability.
Four and a half mile out and back hike from the Warner Valley area of Lassen Volcanic National Park to the Devils Kitchen.
Short hike taking in the spectacular McArthur-Burney Falls.
It's three quarters of a mile round Lake Helen, not really worth doing unless you're waiting for someone to finish paddling...