@Pedro *********
I agree with
@Wannikea ********
and other posters, IF all you're wanting to do is spend 2-3 months here, just get a single entry tourist visa from the thai consulate in Canada using the eVisa system online before you come here.
That will get you stamped in for 60 days and you can get one 30 day extension for 1900baht.
That's the easiest solution that requires the least hoop jumping to do