A guided nature walk with the Friends of the San Pedro River through shaded cottonwood-willow groves, with stops along the San Pedro River and Green Kingfisher Pond. Look for butterflies, signs of wildlife and birdsong. The walk covers 1.5 to 2 miles on easy terrain and is suitable for most adults and children. Free; no reservations required. Participants sign a liability waiver before the walk. Meet at the San Pedro House, 9800 E. Highway 90, 7 miles east of Sierra Vista on the south side of the highway. Questions: (520) 508-4445 or fspr@sanpedroriver.org. End time is approximate.