Hi,

My name is XXXXX XXXXX X'X be happy to answer your questions today.

You are correct that a person is only able to have one driver's license - if you were to apply for a CA license, they would actually take your Hawaii license from you. California requires that you have a CA license if you are a resident, and they consider you a resident if you vote in CA elections, pay resident tuition at a CA college or university, file for a homeowner's property tax exemption, or exercise any other privilege extended solely to CA residents.
http://www.dmv.ca.gov/dl/dl_info.htm

California also requires you to register an out-of-state vehicle in CA if you obtain a CA driver's license, but there isn't a requirement that you be a CA resident to register a vehicle in CA.
http://www.dmv.ca.gov/pubs/brochures/howto/htvr9.htm

Hawaii does not have a similar requirement, and allows a person to drive using a valid license from any state.
http://hawaii.gov/dot/highways/hwy-v/hidlrqmt.pdf

So, since California has the stricter standards, unfortunately, the solution may be to get a CA license. You can try to get the judge to dismiss the ticket by arguing that you do not meet the definition of a California resident based solely on the fact that you've registered a car in CA. I don't have enough facts to know if you might be considered a CA resident for other reasons (such as by paying resident tuition), but it might be worth a shot.
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