If you carry CAD under $10K, you don't need to report it.
"Under the legislation, there are no restrictions on the amount of money that you can bring into or take out of Canada, nor is it illegal to do so. However, you now have to report to a border services officer amounts equal to or greater than CAN$10,000, or its equivalent in a foreign currency that you are bringing into or taking out of Canada."
See the link below:
http://cbsa-asfc.gc.ca/publications/pub/bsf5052-eng.html