"River time." It's that blissful oasis reached only by pushing off from terra firma, leaping board a raft, kayak, or canoe, and leaving the real world behind. Preferably for more than an afternoon. In the West, this generally is accomplished by heading for the Middle Fork of the Salmon, the Green, the Selway, or the Lochsa rivers. For those truly lucky souls, it means putting in from Lee's Ferry onto the Colorado River for two or more weeks of riverine solitude.