@BackPacker: i found the regulation about the 90 day valid visa waiver, but as you said, you did a roadtrip by CAR. So I agree completely with your explanation that you don't need a visa for that.
My trip to canada will last +-15 days and will be by private airplane.
@SoCal: Is it that strange that I ask for confirmation from other people if I doubt the answer of the consulate is correct ? They didn't really point to any regulations. It was a short reply "you need a visa".
Since I've heard the Bamaha story from 2 people now, I really doubt I need a visa for Canada.