I voted Vancouver as it would be the only option available to me. When I tried to get a Visa to visit USA on holiday in 1987 I was refused as I had been in East Germany for a time in 1972 as a student. I know the Cold War is supposed to be over but I suspect terrorist activities in recent years have made the US homeland security even more choosy about who they would allow to visit, so joining an x-marks gethering in any US city would be ruled out for me. I have been to Vancouver when I was younger and could go there again, though realistically it may be too far for my wife to travel. Since she suffered a stroke in 1999 we have restricted our travels to northern europe though we are planning a trip to Gran Canaria for our next wedding anniversary which is a four hour flight so if that goes OK a return to Canada could just be back on the agenda.
Edited to add:- Must have missed spotting the Toronto option. That would be more viable for me as its a much shorter trip than Vancouver.