hi sondra,
The Argentina Passport & Visa Requirements for Canadians are:
A valid passport but no visa for stays up to three months, providing the visit is for touristic purposes only.
So if you're visiting for less than 90 days and have a valid passport, you should be ok. Also, remember that you'll also need proof of your return ticket. You'll want to check with the Embassy of Argentina in Canada to ensure that the requirements don't change before you leave for your trip, the site
here has the phone number.