Do you need a passport to travel to Canada?

Yes.

I traveled from USA to Canada and did not have a passport worked fine. If you have a DUI though you can not go to Canada.

Ofcourse..u need...u always need a passport for goin to any other country(not ur own country though)

If you're an American citizen, I think you only need a picture i.d. and an original or certified copy of your birth certificate.

Yes, and that's a fact. I went to Canada and I had to show my passport. Just to be on the safe side, I brought my birth certificate. By the way, you might want to bundle up if you're going there. It can get pretty cold.

My father just recently visited there for over three months. The only issue he had was that they harassed him for having so much stuff in his car assuming that he might actually be moving there.

He was not required to submit a passport. Birth Certificate, & ID were all that were required.

Right. And he entered Canada somewhere near New York is all I know.

No you don't but if you are takeing your kids you must have their birth certificate with you or some kind of proof that you didn't steal them.

It depends how far into canada you are going if you go far enough into canada then yes you do.

According to the Department of State, no:

"CANADA – Passport OR proof of U.S. citizenship such as a birth certificate, naturalization certificate, and photo ID required. Minors (under 16) traveling alone or in someone else’s custody must present written authorization, signed before a notary, from the parent(s) or guardian. Visas are not required. Canadian immigration officials at ports of entry will issue persons planning to stay longer than 180 days a visitor’s record. Anyone with a criminal record (including a DWI charge) should contact the Canadian Embassy or nearest Consulate General before travel. U.S. citizens entering Canada from a third country must have a valid passport. HIV testing required for resident applicants who are over 15. A temporary resident applicant requires immigration medical examination if stay exceeds 6 months or seeking to work in Canada. For student or business travel, check with the Canadian Embassy, 501 Pennsylvania Ave., NW, Washington, DC 20001 (202/682-1740) or the nearest Consulate General: CA (213/346-2701), MI (313/567-2085), NY (212/596-1700 or 716/858-9501), or WA (206/443-1375). Internet: www.canadianembassy.org"