Last Sunday my daughter and I set out for a long walk along the urban river. She embraces the outdoors with precocious gusto, discovering the simple wonders of flowers and animals and rocks to be thrown into the water. On this excursion, with her rain boots and tiny hiking pants, she discovered the joys of stomping in the shallows, and of watching schools of tiny fish. We walked close to a mile downriver to where you can watch the planes come in over the spot where the river widens and the waterfowl gather in the shadow of the old bridge, and both earned a long nap. It will soon be too hot to undertake such an excursion after 9 a.m., but for now the temperature is just right, and the world around us is green, charged with the juice of spring rain.