Seneca Creek

Just to emphasize: there is a double-ledge, double-hole drop behind a boulder where I got stuck and had to swim after coming down the upper section (not really Class 3, so much, at high levels). I've usually run it on the right, but that seems, uh, unsatisfactory. Try left.
And the ledge at Onego is truly terrifying at high levels. I snuck it tight right. Stay out of those holes, for sure!
Also, the log jam near the top can usually be snuck without portaging if you cut left way-high above the log jam.