7, but redwood national park is just too far. All without traffic of course.
Kings Canyon Sequoia Yosemite Lassen Volcanic Pinnacles Muir Woods Point Reyes
Kings Canyon Sequoia Yosemite Lassen Volcanic Pinnacles Muir Woods Point Reyes
https://en.wikipedia.org/wiki/File:NationalParks.forwiki.pdf
https://en.wikipedia.org/wiki/List_of_national_parks_of_the_...
But, Muir Woods is part of Golden Gate National Recreation Area and Point Reyes are not separate parks.
http://www.blm.gov/ca/st/en/prog/nlcs/California_Coastal_NM....
http://www.fs.fed.us/visit/berryessa-snow-mountain-national-...