Did you bring them on canoe trips when they were younger?  Not that that would bring about interest in and of itself so just wondering.

Kids are kids and they will find their interests as they slog through life.  All 4 of my boys were in a canoe by the time they were 5 years old and 3 of them love it while one of them runs away when he see's the tent being set up on the lawn for waterproofing.  Similarily, only 2 of the 4 follow my sports passion for wrestling and none of them want anything to do with bagpiping.   :o

Leave the guilt at home brother.  Maybe someday they will find your pictures and maps and that spark to "see what's over there" might fire.  I do this a lot in my house - leave the maps out on the table on purpose and frame my pictures of big fish and hang them around the house.  They all ask about the pictures; what lure were you using, what lake, how big, etc...  I've made a lot of canoe camping converts (including my wife) by doing this.