OUTDOORS BIODIVERSITY WALKS. The Southwest Center for Biological Diversity offers "biodiversity walks" at 9 a.m. every first and third Sunday of the month. Join Center staff and expert guests 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 lasting two to three hours. Don't forget your 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. WALNUT GULCH HIKE. This moderately strenuous seven-mile hike follows Walnut Gulch by winding in and along an old railroad grade to historic Fairbank. Transportation will be provided to the trailhead at the Schiefflein Monument in Tombstone. Meet at 8:15 a.m. Saturday, December 7, at the ghost town of Fairbank on Hwy. 82. Pre-registration and pre-payment are required, with participation limited to 40 hikers. Dress in sturdy, comfortable clothes and shoes and bring at least one quart of drinking water and some food. Hikes will not be canceled due to weather. For information and registration call (520) 459-2555. Ask about slower-paced interpretive weekend walks for the whole family. 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. Sunday. The park offers additional guided tours for your enjoyment. Call 742-6455 for park information and daily events schedule.

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