If as you say the LEOSA only covers concealed carry, I believe you would be under the same restricitons concerning open carry as any other normal citizen. As such you should review the Open Carry Pamphlet and the Open Carry Flyer both located in the California Forum. You would be restricted to Unloaded Open Carry in incorporated cities or while in prohibited areas of unincorporated territory. You would also have to be on the watch for School Zones.
If you are intending to Open Carry as a political statement of support for our rights here in California, go for it, but study up first.
If you intention is to carry strictly for personal self defense, then I suggest you utilize the LEOSA provisions and carry loaded and concealed.
I am not a lawyer, and am unfamiliar with the intricacies of the LEOSA, but enjoy your trip and carry how you are most comfortable within the scope of the law.