This is a bad idea, don't do this; follow the laws please.
I have read every post on this thread and could not resist giving my own .02. Without getting into a debate of letter vs. spirit of the law the 2nd Amendment protects the rights of citizens to keep (own) and bear (carry) arms however, it makes no allowance as to where you may carry the same as it makes no restriction.
If you disagree with a business restricting your right to carry a firearm on their property I encourage you to take your business elsewhere as well as informing them as to why.
That said, I ask that ANY individual who legally owns and carries a firearm follow the laws in their locale regarding carrying. The argument that those signs only restrict law-abiding citizens from carrying is only valid as long as we, as law-abiding citizens, follow such restrictions. The minute anyone knowingly and intentionally violates such a restriction you place yourself in the other group, that of the criminal violating the law and put everyone else in a position to be lumped in with you. IMHO, it is not in keeping with the THR way to blatantly ignore or violate such a restriction. I believe that anyone who legally owns and carries a firearm is obligated, whether they agree or not, to follow to laws regarding such in their area.
I am a new member here at THR but I believe that my voice on this subject still has some value.
With that in mind I would like to share that I live in Minnesota, a state with similar laws regarding signage restricting carry, and can sympathize with the OP. There are a number of places that I frequent with signs posted restricting carry including my own workplace. Some I find annoying/frustrating, others I am indifferent about but regardless of my feelings I would abide by the law.
Just as it is my right to keep and bear arms, it is a business' right as well as an individual's to restrict carry on their property. Whether it be a local business, a friend, or a family member if they do not want me carrying a firearm on their property I will respect that and decide if it is somewhere I wish to be.
Please, if you do not agree with restrictions regarding carry by anyone, let them know in an intelligent and calm manner but abide by the laws and regulations in your area. If you violate them, whether you are caught or not, you are furthering the cause of those arguing against the 2nd Amendment and your rights and hurting your own cause.