http://www.cnet.com/uk/news/man-cha...-up-phone-passcode-to-canadian-border-agents/
There is probably good food for though in this thread and the attached article.
Make a list of complete non-hobbying things you are going to do. The casino, Mont Royal, biosphere, bike riding, crescent street, cathedrals, restaurants, etc., etc. Most hobbyists actually do a lot of that stuff, but if you don't just buy a $1 used travel book off of Amazon, bring it, and memorize some stuff.
Consider keeping your notes and conversations in electronic places inaccessible through a simple cell phone search, like the private message section of Merb. And delete the pre-trip text message conversations in your cell phone with escorts and agencies.
It baffles me as to why anyone would mention anything remotely sexual to a customs agent. Anyone can make a mistake, but hobbying in the States involves constant hassle and lying. Traveling to Montreal involves very minor lying and hassles.
Amazing how much easier it is to get in and out of Europe for U.S. citizens than it is to and from Canada.