I have a u.s permanent residence card. do I need a visa to visit canada? or what type of doc. do I need?

You can and you can't it depends on how strict the laws are, and you would have to write a letter stating why you are coming to the USA and hand it to the garden crossing the border & happy pay $5.00. I then going home give them that same note and $5.00 to pass the border. I hope this helped.

Yes, provided you are from a visa waiver country. Official details here: https://help.cbp.gov/app/answers/detail/...

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