Congratulations on your 20th and happy planning for your celebration trip! You might use the search tool on the menu bar at the top of this page. We had a discussion of this topic during the past summer. Use key words: Canada, border crossing, and so on. You'll find some useful information. As well, I think members will add to the discussion on this thread
I know we need to get passports by next year; you already have them! ~G