Sometimes the customs agents are present on the dock and will come down to your boat after you have checked in with them, so be conscious of how much booze you are bringing in. I'm not sure if the limit is per person or per boat. They will also search for fruits and veg that are on a no entry list to Canada.
S/V Don't Panic!
“Navigare necesse est, vivere non est necesse” To Sail is vital, to live is not.