OUTDOORS 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. ARCHAEOLOGY OPPORTUNITIES. Gain training and research experience by volunteering on projects with Old Pueblo Archaeology Center. Call 798-1201 for 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. ASDM horticulturist George Montgomery introduces Trees of the Mountain Habitat, Grasslands and Riparian Areas from 7 to 9 a.m. Wednesday, May 22. Cost is $5, $15 for non-members, and registration is required. Museum hours are 7:30 a.m. to 6 p.m. Sunday through Friday, and 7:30 a.m. to 10 p.m. Saturday through September. Admission is $8.95 ages 13 and over, and $1.75 ages 6 through 12. Discount group rates are available. 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 eight-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. MUD AND STONE. DuVal Auditorium, University Medical Center. 1501 N. Campbell Ave. 621-4609. R. Brooks Jeffery gives a free lecture,The Desert Architecture Of Yemen, at 7:30 p.m. Monday, May 20. Call 621-4609. 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. 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. ORIENTEERING. The Tucson Orienteering Club meets the third Sunday of the month at various locations. The next meeting is May 19. Bring a compass and whistle. Cost is $7 per team, $5 individual. Call Mike Huckaby at 324-0209 for directions and information, or e-mail jimstamm@aztec.asu.edu. 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, docent-guided looks 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. Helga Teiwes presents a slide lecture on Native American tribes of the Southwest at 7 p.m. Tuesday, May 21, RSVP. 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. VOLUNTEERS NEEDED. Sabino Canyon Volunteer Naturalists seek individuals who love nature, the outdoors and working with school children. Training begins in September. Call 289-4902 for information. Out Of Town SEE THE TREES. Visit the Arboretum in Flagstaff from 10 a.m. to 3 p.m., with guided tours at 11 a.m. and 1 p.m. weekends through September. Pack a picnic lunch and cool off among the many garden displays, see endangered plants and animals, or just relax under a pine. Admission is $3, free for those 18 and under. Follow Route 66 west to Woody Mountain Road, turn left, and head south 3.8 miles. Call 520-774-1441 for information.

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