If you are from a visa exempt country, then you can visit on your passport. If you are from a non-visa exempt country, then you will need to apply for a Temporary Resident Visa (i.e. tourist visa).
Many people do not require a visa to visit Canada. These include:
citizens of Andorra, Antigua and Barbuda, Australia, Austria, Bahamas, Barbados, Belgium, Botswana, Brunei, Croatia, Cyprus, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Israel (National Passport holders only), Italy, Japan, Korea (Republic of), Latvia (Republic of), Lithuania, Liechtenstein, Luxembourg, Malta, Monaco, Namibia, Netherlands, New Zealand, Norway, Papua New Guinea, Poland, Portugal, St. Kitts and Nevis, St. Lucia, St. Vincent, San Marino, Singapore, Slovakia, Solomon Islands, Spain, Swaziland, Sweden, Slovenia, Switzerland, United States, and Western Samoa;
persons lawfully admitted to the United States for permanent residence who are in possession of their alien registration card (Green card) or can provide other evidence of permanent residence;
British citizens and British Overseas Citizens who are re-admissible to the United Kingdom;
citizens of British dependent territories who derive their citizenship through birth, descent, registration or naturalization in one of the British dependent territories of Anguilla, Bermuda, British Virgin Islands, Cayman Islands, Falkland Islands, Gibraltar, Montserrat, Pitcairn, St. Helena or the Turks and Caicos Islands;
persons holding a British National (Overseas) Passport issued by the Government of the United Kingdom to persons born, naturalized or registered in Hong Kong;
British subjects who hold a passport issued by the United Kingdom and who have the “right of abode” there
persons holding a valid and subsisting Special Administrative Region passport issued by the Government of the Hong Kong Special Administrative Region of the People’s Republic of China;
persons holding passports or travel documents issued by the Holy See;
persons holding an ordinary passport issued by the Ministry of Foreign Affairs in Taiwan that includes their personal identification number.
