OUTDOORS BIODIVERSITY WALKS. Southwest Center for Biological Diversity's Biodiversity Walks resume at 9 a.m. Sunday, October 20, and continue the first and third Sunday of each month. Join Center staff and guest experts for a walk along Cienega Creek. Learn about the importance of riparian habitats for wildlife and water quality, and the implications of grazing management. Expect a two-mile walk over two to three hours. Don't forget to bring a hat and water. Call David Hogan at 733-1391 for reservations and directions. NATURE CONSERVANCY. Get out of the bustle of town and take a trip to the Nature Conservancy's Patagonia-Sonoita Creek Visitor Center. There you can get back to nature and enjoy bird watching, guided tours and hikes. Regular preserve hours are 7:30 a.m. to 4 p.m. Wednesday through Sunday. Take Highway 82 to Patagonia, head west on Fourth Avenue, and south on Pennsylvania. Call (520) 394-2400 for information. TOHONO CHUL PARK. 7366 N. Paseo del Norte. 742-6455. Tohono Chul Park grounds are open from 7 a.m. to sunset daily. Exhibit hours are 9:30 a.m. to 5 p.m. Monday through Saturday, 11 a.m. to 5 p.m. Sunday. Admission is $2. Enjoy a Walk in the Park tour at 8 a.m. Tuesday and Saturday; Art in the Park tours, docent-guided looks at gallery exhibits, are at 11 a.m. Thursday and Sunday. The park offers additional guided tours for your enjoyment. Call and ask for a complete schedule of daily events. Call 742-6455 for Park information.

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