A morning on the Animas River begins with the city’s low hum — coffee shops opening, the narrow-gauge steam whistle in the distance — and then the river takes over. The Quarter-Day Family Friendly Trip launches from the Albertsons lot beside Durango’s DoubleTree; within minutes you trade sidewalks for the river’s edge. Sun hits the water in strips, and guides from Mountain Waters Rafting hand out helmets and life jackets with the matter-of-fact cheer of people who do this every day. The raft rocks, the current nudges, and a gentle sequence of Class I, II and a handful of III waves wake up smiles rather than nerves.