As a Canadian I have always bought a Interagency pass for the National Parks. It costs me $80 US for a year,thats about $110 Cdn, is it worth it,Yes. We have traveled through the southwest and northwest, going through most of the NP in those areas. They are beautiful places to visit and to stay. Is a $110 a year lot of money. No, not when a have a $100,000 vehicle unit and spend at least $100 on fuel and camping per DAY. Do I save money on this pass, sometimes yes and sometimes no.