2-3 day float trip in WA, ID, or Mt?

[ekuno]

I was simply wondering if anyone could help me find a 2-3 day float fishing trip which can be done in 9' pontoon float tubes. Preferably an easy float with relatively few encounters with fellow anglers (I know this is hard sometimes). It can be either fly or bait casting. I have been considering rivers like the Missouri and Madison in Yellowstone and the South Fork in Idaho. Any suggestions or comments would be very much appreciated! [fishin]
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[flygoddess]

Here in Utah the Green of course, but there are sections of the Snake that a pontoon would be a blast.
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