Nice try, but I don't think they opened a loophole for California concealed carry...
Title 36 -- Parks, Forests, and Public Property
Chapter 1 -- National Park Service
Part 2 -- Resource Protection, Public Use, and Recreation
Section 2.4 was amended by adding the following paragraph:
"(h) Not withstanding any other provision in this Chapter, persons may possess, carry, and transport concealed, loaded, and operable firearms within a national park area in accordance with the laws of the state in which the national park area, or that portion thereof, is located, except as otherwise prohibitied by federal law."
Title 50 -- Wildlife and Fisheries
Chapter 1 - United States Fish and Wildlife Service, DOI
Part 27 Prohibited Acts
Subpart D Disturbing Violations: With Weapons
Section 27.42 Firearms, was amended by adding the following paragraph:
"(e) Not withstanding any other provision in this Chapter, persons may possess, carry, and transport concealed, loaded, and operable firearms within a national wildlife refuge in accordance with the laws of the state in which the wildlife refuge, or that portion thereof, is located, except as otherwise prohibitied by federal law."
NOTE that "except as otherwise prohibited by federal law" phrase means that rules/laws prohibiting concealed carry in federal buildings still stand. So I guess you can carry your gun in the park, but you can't take it into the visitor's center.
Here is a link to the Department of the Interior press release announcing the final rule:
http://www.doi.gov/news/08_News_Releases/120508.html" onclick="window.open(this.href);return false;
Here a link to the DOI's final rule, with the language I quoted above, plus all the other governmental overhead that goes with it (25 pages of text to implement two, nearly identical, one-sentence additions the the CFR!)
http://www.doi.gov/issues/Final%20Rule.pdf" onclick="window.open(this.href);return false;