Mark, it sounds like a fun trip. You might want to consider bringing a rescue rope throw bag. Even in quiet river paddling these are handy. In faster rivers they are essential for quick rescue while minimizing risk to the rescuers. If you do take one be sure to review and practice how to use it efficiently and safely.

I'm sure you're considering your tactics on the river. It Is often a good idea to have the last boat be level headed, strong paddlers with good rescue skills. They can act as "sweep", to encourage lagging boats, make sure no one gets inadvertently left behind, and in a worst case to conduct a rescue if a boat capsizes.

Have fun!