Greg, like some others on here I just read through all 7 pages of this thread. I am so excited for you and your kids for having done this trip. Sounds like it was a pain in the ass, but you did the "good dad" thing and stuck with it for their sake. My first raft trip was with my dad when I was 15. Obviously, a little older than your kids, but 17 years later (gasp!) I'm still rafting, living in Colorado and enjoying the wilderness. All thanks to a Great Dad! For your own piece of mind...I'm about to become a nurse, which shows that I'm not just a dirty raft guide anymore.
Kudos to you! Your kids won't forget the trip!!