Here is the link for California's weapons laws:

http://www.leginfo.ca.gov/cgi-bin/waisgate?WAISdocID=19954512940+1+0+0&WAISaction=retrieve

In a nutshell, no dirks or daggers concealed, no blade length limitation (except on school grounds), pepperspray is OK if small container, California does not honor any CCW's from other states, unless you are a peace officer in another state.

Enjoy your visit. Bring rain gear, as we have been seeing lots of it (March broke all previous records). Use situational awareness and you should be OK in the tourist areas.
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"We are not allowed to stop thinking"