Soren,
Here's a nice Idaho ride site by Grumbler (hope you don't mind Grumbler, I stumbled across your website reference on MCN or somewhere a month or so ago). When you say Hell's Canyon ride are you referring to Hwy 71 from Cambridge to the Brownlee dam on the Snake river? I know north and Central Idaho better. I (and Friar) can ride through the high country there and back.
http://myweb.cableone.net/grumbler/index2.htmlThe dates don't make a great deal of difference to me, a week later would give a break from the Nelson, BC (3-4 day) rally however. If that works better for Bob & Amy from CA that'd be fine.
..Just thinking out loud, not trying to complicate plans

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JH