Canada is celebrating its 150th birthday this year with free access to their national parks, national marine conservation areas and national historic sites. Other special events will take place throughout the year (http://passport2017.ca/).  One free Discovery Pass is good for one vehicle regardless of number of occupants.  It doesn’t cover most other activities within the parks such park ranger led tours.  Canada has 47 national parks in all 13 provinces.  Enjoy the sesquicentennial from coast to coast!