Thanks for the input everyone. I should have specified that this will be B&W film. I've decided that I will try to take as much film with me on the river as I can, where I should be able to keep it from getting too hot. That will probably be 26 sheets loaded in 13 holders. I may throw another holder or two in the car, inside a down bag, shoot something with it and see how it looks when I develop it. This trip is more about seeing friends and family than photography, so I don't want to go to some of the lengths suggested above, although they may prove useful in the future.
The river trip is a "private," and we are going spartan, by river trip standards. I'll be paddling the smallest craft and someone else will be hauling someof my gear, so I have to be careful about loading them up with too much stuff! I'll be paying someone to shuttle my car and I suspect they'll park it in the sun. I don't think there will be any ohter choice.
I should have been clearer in asking if anyone had tried something simpler than ice - sorry!
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