You can certainly travel to Cuba via Canada, the provisos are, that upon re -entering the U.S., you don't tell them you've been to Cuba, but merely in Canada on Holiday. Also, when clearing Cuban Customs and Immigration, ask them not to stamp your passport. Apparently they can stamp an official Cuban form that you carry with your passport, and then discard upon return to Canada.

Happy Travels

John Wiernikowski Hamilton, Ontario CANADA