I am F1 and my wife H1. We want to visit Canada around Christmas. I thought we don't need the Canada visas to visit Canada and don't need the visas to come back to US. However, my friend told me that I need the Canada visas to visit Canada. I am confused. Do we need to apply visa to Canada? I remember that somebody here said that the F1 and H1 can visit Canada without visa within 30 days. Is that true? Anyone has the experience of the visa, please help to make me clear. Thank you very much!