So that is to say $100.00 Canadian will get you roughly $969.002 Pesos while $100.00 US will get you roughly $1034.63 Pesos
Freewilly you may find it less complicated if you convert to pesos not dollar. By useing the dollar it adds extra math and can cost you money. For more advice I suggest checking out this site it has a coverter and more. http://www.cancuncare.com/Money_in_Cancun/
We always convert to USD at home and just take the USD down with us. I don't find it necessary to have Pesos. D
If you understand the conversion of dollars then it can work for you. However, if you are unsure of it, it would be better to convert straight to pesos.