OUTDOORS RESOURCE CENTER. Celebrate the grand opening of the Center for Biodiversity's new Downtown Resource Center from 4 to 8 p.m. Sunday, May 5, at 224 N. First Ave. Food and spirits will be served. Call 624-7893 for information. FIELD STUDY. The Coastal Conservation Foundation of Tucson offers Proyecto Tortuga, a field study program on sea turtle restoration in Southern Mexico. Participants patrol beaches and work with eggs and hatchlings in a nursery. Program runs from July through October. CCF is a non-profit conservation organization. For information write: Dan Dasse, Coastal Conservation Foundation of Tucson, P.O. Box 3621, Tucson, AZ 85722; or call 798-1844 for information. NATURE CONSERVANCY. Visit the Nature Conservancy's Patagonia-Sonoita Creek Visitor Center 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. DIG IT. Old Pueblo Archaeology Center, a non-profit agency, offers public archaeological field school sessions at Sabino Canyon Ruin, home of Hohokam Indians 700-900 years ago. The program features instruction in archaeological excavation techniques, artifact recovery and care, and interpreting ancient cultures. Lunch is provided. Cost is $69 per 8-hour day with discounts offered to groups and multiple day sign-ups. Reservations required 2 days in advance. Call 798-1201 for reservations and information. NATURAL HISTORY LECTURES. A series of natural history lectures are offered from 10 a.m. to 2 p.m. throughout the month of May at Santa Rita Lodge in Madera Canyon. Cost is $15 per lecture and includes a light lunch. Reservations required. Take I-19 South to Exit 63. Follow the signs to Madera Canyon. Call (520) 625-8746 for reservations and information. ARCHAEOLOGY TOURS. The Center for Desert Archaeology offers half-day and full-day tours of the Romero Ruin in Catalina State Park and rock art tours of sites near Tucson. Contact Connie Allen-Bacon at 881-2244 for more information on tours. Individual, group and corporate rates are available. SAN PEDRO HIKES. Hikes along the river continue throughout the spring. Hikes range from five to seven miles and range from moderately difficult to strenuous. Bring a minimum of one quart of water per person, wear proper hiking shoes and dress appropriately. Sunscreen, sunglasses, hat and snacks are important. Not appropriate for small children. Pets prohibited. Pre-registration is required. Cost is $7.50 per hike. Call (520) 458-3559 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. The park presents "Walk in the Park Tours" at 9 a.m. Tuesday, Thursday and Saturday, and 1 p.m. Sunday. "Birds of Tohono Chul Tours" depart at 8 a.m. Monday, Wednesday, Friday and Saturday. Tours last about one hour. "Art in the Park Tours," a docent-guided look at gallery exhibits, are offered at 11 a.m. Tuesday and Thursday and 2 p.m. Sunday. Join the free xeriscape tour at 11 a.m. Saturday, May 18. Learn how to take the heat in Surviving the Sizzle at 2 p.m. Tuesday, May 7, in the Wilson Room. Lecture is $2, free to members, and reservations are required. The Tohono Chul Tea Room serves twilight dinners from 5 to 8 p.m. Call 797-1711 for dinner reservations. Call 742-6455 for reservations and information. Arizona-Sonora Desert Museum. 2021 N. Kinney Road. 883-2702. The museum is part botanical garden, part geology museum and part zoological park. Naturalistic settings house 1,386 plant species and 317 animal species. Live animal visits, botanical and raptor interpretations are given daily. During the month of May live animal interpretations are offered at 8:30, 9:30 and 10:30 a.m., and 1:30 p.m. Guided tours depart daily at 8 and 8:30 a.m. Early morning birdwalks meet at 7:30 a.m. Tuesdays and Thursdays. Saguaro flowering interpretive demonstrations are at 10 a.m. daily. Spend a night at the museum and watch the sunset through filtered telescopes in Starry, Starry Night, beginning at 6 p.m. Saturday, May 18, and ending at 8 a.m. Sunday, May 19. Cost is $12 adult with children, and $4 per child. RSVP by May 11. Museum hours are 7:30 a.m. to 6 p.m. Sunday through Friday, and 7:30 a.m. to 10 p.m. Saturdays May through September. Admission is $8.95 ages 13 and over, and $1.75 ages 6 through 12. Discount group rates are available.

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