As my sign on implies, I paddle whitewater kayaks. Been doing it for fifteen years or so. I've gone thru multiple pairs of sandals, starting with Tevas back in 1991, then on to Alps, Gecko - which became Chaco, and finally Keen. (Also: Birks and Ecco for casual, dry wear.)
I was a big, big supporter of Chaco, especially back in the Gecko years, but it seem their overall quality has gone down. I've given the last pair more than enough time and miles to break 'em in and they just don't match the build or comfort of the earlier stock.
The Keens, though. Oh, baby! These things are, hands down, the most comfortable, stable, and well thought out sandals I've ever owned. I'm sold!
I wouldn't, however, recommend my Newports or H2 for any real hiking. Short walks of a few miles w/o full back are no problem though.
I've learned to buy good shoes... my feet thank me for it!