The closest national park to San Francisco?

What's the closest national park to San Francisco?

Of the several national parks in California, what is the closest national park to San Francisco that is easily accessible by bus departing from San Francisco?

Yosemite, Sequoia, Redwood, Pinnacles, Kings Canyon?

Update:

I'm not just talking about the distance. I'm looking for if there are any bus trips(package tour programs) available from San Francisco.

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