You have to find out all your rights. Nobody will hand it to you. California does not require you to have ID except under very few circumstances (like when you're driving a car). Just walking around town, shopping in the grocery store, sitting on your porch or playing in the park does not require you to have ID. Just because we're police officers does not allow us to require identification from people. Hiibel v. Nevada does not apply in California, even though it was decided by the US Supreme Court, because California has no requiring you to identify yourself when detained on reasonable suspicion of criminal activity. Nevada does, and Hiibel was convicted of violating it. If California had such a law, then Hiibel would apply. California does have a law having to do with resisting, delaying or obstructing an officer performing his duties, and it's possible someone can make a case for this if you refuse to ID yourself - I haven't seen it done yet, though. Passengers in a vehicle are not required to show ID upon request merely because they are passengers.