Guided bird walks and a hike to beaver dam are among four walks starting between 7 and 9 a.m., Saturday, May 7. More than a dozen informational booths and exhibits represent a wide range of conservation and environmental organizations from 10 a.m. to 2 p.m. Wagon rides and a kids' ramada offer many activities for children. Free. Call or visit sanpedroriver.org for more information.