If you want to make friends with a Canada I find the best way is to offer them some cracked corn. They cannot resist and I guarantee they will be your friend for life. I offered some corn to a couple that was hanging out at the local pond and now they hit me up for some every time I walk by.
Get their attention by calling them over and then put a little pile (pile it high!) on the ground and tell them to have some corn. They'll hiss at you but keep on telling them to have some corn and then back off about 8 feet. It may take a couple of minutes, but usually the femal is curious and they will come and eat.
Also, have you hung around in the area near the geese, so they get to know you??? You know, just sit down on the ground about 6 or 8 feet away with a good book and read??? If they see you alot and you are relaxed and not bothering them they will think you are just another animal and that you are no threat to them.
Canadas are truly the most beautiful and most amazing bird I know.