Well, it's possible that an over zealous cop would arrest you for brandishing a weapon, but I seriously doubt that a DA would touch that case if you weren't doing anything illegal and just going about your business.
Still, I think your demeanor and actions if/when you interact with law enforcement will most likely determine your fate. As long as you're courteous, and make sure that they know that you know your rights without sounding like a smartass or like you think they're an idiot, you should be okay.
A DA might not touch it, and it could be defended against in most cases.
However, you could end up sitting in jail for something stupid, on their part. A lot of cops can be over zealous, and some very decent, it depends on who you deal with, just like any other profession.
If your carry yourself professionally, and act decent with them, show ID, etc... you should be able to talk your way out of most conflicts.
I support your right to OC, and I hope you do, it is a unique experience, however I don't want to hear you came back from a 7 day va-ca with 1 of them spent in the slammer because of some idiot cop! Know the laws, and ordinance before you go (print them up possibly), and you will be good.
By the way, what are you going to be packing, and what type of holster?