If you visit a reservation and manage to find some Native Americans that wholly follow the old ways, they may let you join in with tourist attraction rituals, but I doubt if they would allow participation, or viewing, of the real stuff.
There is a Native Canadian Centre of Toronto where anyone can become a member. They host many spiritual rituals including drum dance and POW POW, etc. They also teach native languages, crafts and other skills. Elders are available for consultation. Sometimes there are organized tours to visit aboriginal sites. I must confess that I have not explored all the activities since I became a new (non-native) member. I would guess there are similar organizations in your area.
Your welcome to visit my reserve, Kitigan-Zibi, Maniwaki, Quebec, for a spiritual gathering that is held every year by respected and world-renowned elder, William Commanda. People come from as far away as Mexico and Peru to attend. There are workshops and sweats in a sweat lodge.
For more information, you can visit his site Circle of All Nations,