YOSEMITE TRIP REPORT:
Groveland, CA restaurant: 0.0% (except my family, we ate on the patio)
Groveland, CA grocery store: 100% employees (clearly required, half of them were wearing them wrong), 20% customers (I'm guessing mostly tourists). There were signs everywhere asking people to wear masks but said they can't make you
Yosemite employees: 100% the first day, about 80% later on. They actually had a fantastic setup for buying souveniers from the bookstore to keep people from going inside but still get their stuff quickly
Yosemite guests: 10-20% on the Valley theme park trails and in restrooms and shops, less than 5% on the more isolated trails. I bet the number would drop to around 1% on trails and 5% inside if you took people of east asian descent.
Fruit stand in the valley about an hour from Oakland: 0% of employees (one person), 100% of customers (my family)
El Pollo Loco drive thru: 100% employees, looked like about half of them were wearing them incorrectly. Looked inside and would guess 20% of dine in guests were wearing them