I recently rafted the Rogue River with some plein air friends and then wrote an article about it. (That is James Sampsel, our trip leader, painting behind me.)
The article will be about the experience itself and how one goes about preparing for it, and it will appear in the December/January of PleinAir Magazine. So keep an eye out for it and have fun as you read it!
And if you aren't already a subscriber perhaps you should be one.
It's available in print and online.
Email me for more information. – TJK