A summer sun slides along the river and the guide eases the boat into a quiet current; the sound is the kind that makes conversation slow down. On this three-hour float, chairs are set up in the pontoon like theater seats for a show that never loudly announces itself: the Teton Range rises to the west, cut in sharp angles that etch into blue sky, while the Snake River threads silver through cottonwood groves and grass flats. Bald eagles wheel overhead, pelicans drift like punctuation marks, and the occasional moose appears at the water’s edge, head bowed as if in private contemplation.