I have done many many overnight and weekend trips on the Buffalo. For an all around good time, I recommend Carver to Tyler's Bend. Easy float, good fishing and really good scenery with Skull Bluff and the Nars. It borders a wildlife mgmt area for about half of the float and there are plenty of access points along the way in case you have trouble. The fishing is better the further down river you go. My next choice would be anything from or between Gilbert to Rush. Rush to the White is good but there are lots of long pools to paddle if current is low and absolutely no access. If something went wrong or weather came up, you have no choice but to ride it out.