Doesn't matter, hope you guys have fun. I always think if you can enjoy outdoor entertainment, you are right to be in North America.
Next target could be Yellow stone park.
Official Jasper national park site here: www.jasper.ca all information about jasper here, admission fee, accomodation, etc.
Banff's here: http://www.pc.gc.ca/pn-np/ab/banff/index_e.asp