Plane Ticket and passport enough?

[Veela]

I am a Mexican citizen living in the united states. I want to go to Canada. Can I just buy a plane ticket and show my passport when I arrive in Canada? I remember long ago that Mexicans didn't need a visa to visit. I know this has changed, but can I fill out all the paperwork once there? I don't know when I would be able to go exactly, so I hesitate to try to fill out paperwork now. I also don't think I would get a response back by the time I would have time/vacation time to go.

 

[amikety]

You will need a visa to go to Canada:

http://www.cic.gc.ca/english/visit/visas.asp

Here is the main page for Visitors:

http://www.cic.gc.ca/english/visit/tourist.asp

In addition to the TRV, you're going to need a return ticket home. Chances are, the airline won't let you board the plane TO Canada without one.

 

[scylla]

I know this has changed, but can I fill out all the paperwork once there? I don't know when I would be able to go exactly, so I hesitate to try to fill out paperwork now. I also don't think I would get a response back by the time I would have time/vacation time to go.

You have to apply for the visa in advance. You can't apply at the border / at immigration.

The airline won't let you board the plane without an approved visa.