I heard this from the organisers. This river is far, but worth running two days in a row. See the description at <http://www.kipawariver.ca/eng/riverdesc.html>. It is long, mostly Class III with a few Class IV+ rapids. Typically, people run it in playboats but larger boats are fine of course too. For the record, I did it in my 2nd season and ran (and screwed up) every rapid, but still had a good time!
--Christian