riverman wrote:
We don't really want to
encounter other trips on-river,

Forget the Bonaventure then. In the past 20 years it has become
popular. Quoting from a dissatisfied on-line source: "There are dozens
of groups going in every day, driven up to the lake by the outfitters.
Solitude is out of the question, and the campsite races begin in
earnest every day around 3 in the p.m."

Scratch that one.

Check your e-mail; I'm sending you something that may be helpful.