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 1-520-394-2400 for information. PERMACULTURE WORKSHOP. The Permaculture Drylands Institute presents a one day Rainwater Harvest and Swale Building workshop from 9 a.m. to 4 p.m. Sunday, April 20, in Texas Canyon, Dragoon, Arizona. Cost is $65, with some scholarships available. The Native Edibles and Medicinals workshop meets from 9 a.m. to 4 p.m. Sunday, April 27, in the Tucson Mountains. Cost is $60, with some scholarships available. Call Barbara Rose at 744-9305 for registration and 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. Walk in the Park tours are offered at 9 a.m. and 1 p.m. Tuesday, Thursday and Saturday. Art in the Park tours, docent-guided looks at gallery exhibits, are at 11 a.m. Tuesday and Thursday, 2 p.m. Sunday. The park offers additional guided tours for your enjoyment. Call 742-6455 for park information and daily events schedule. Out Of Town EARTH DAY. Celebrate Earth Day at Oracle State Park, Center for Environmental Education, from 8 a.m. to 5 p.m. Saturday, April 19. Activities include hiking, guided nature walks, family activities, and tours of the historic Kannally Ranch House. Admission is free, with a free shuttle from the Oaks Festival in Oracle. Call 1-520-896-2425.

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