There are several different annual passes available from state parks depending on the type of park, or number of parks you wish to visit. Passes are good for 12 months from the date of purchase and are available at the Visitor Center at Marshall Gold Discovery SHP. Visit https://www.parks.ca.gov/?page_id=1049 to learn more about the types of passes available and the fees..
Yes, check CA parks for info on an all parks season pass. No season pass for specific parks that I am aware of. Also for SF American river swimming in that area look up county parks.
I would bet so bit dont know the specifics. call park authorities
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