Great tough question Jeff! I'm up for joining you on a mission next year though
I'm also up for joining on your mission Jeroen. I love the multicraft aspect of the trip.
I have to say that getting on the Futa in Chile, before its killed by big dam projects, is at the top of my list. A Norway waterfall mission would be amazing as well. Always a winner is west coast NZ heli creeking. So many rivers in the world and never enough time and money to make it happen.
If your a solid boater and haven't paddled the Potomac, especially Great Falls, then for sure this needs to be on your bucket list!