Most of the Sierras don’t require any type of permit or ticket to access. I’ve noticed among techie friends with a new desire to go outdoors a belief that they need to make an appointment to enjoy nature, and since all the appointments are taken online, there is no nature to enjoy. Or to google for “best hike San Francisco”, go there, and find that the parking is full.

In fact the nature is much larger than the city, and it’s most entirely empty if you aren’t intentionally visiting the most popular spots.