I remember when I tried to cross the U.S. border by my self, I told the custom officer, I would meet a customer to do business and that agent denied my entry. I supposed to get there by bus but a taxi driver picked me up at the border and he told me to keep my mouth shut when it's time to do business. By the way, I met somebody who told me, not to tell any custom officers in any country in the world. My advice is, keep your mouth shut with business and tell these agents, you only visit and that's it. Finally I had to take the bus to come back in Montreal after I finished to talk with the Canadian custom officer.