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. DESERT ARCHAEOLOGY TOURS. The Center for Desert Archaeology offers whole- and half-day tours of local archaeological treasures, including: the Romero Ruin Tour, a look at the remnants of the four great cultures that once inhabited the Catalina State Park area; the Rock Art Tour, an in-depth look offering hikers a chance to visit petroglyph sites near Tucson; and the Downtown Tucson Tour, featuring more than 30 centuries of history. Half-day tours are $40, full-day treks are $70, with group rates available for groups of three to 45 people. Wear long-sleeved clothing and a hat, and make sure you've got sturdy shoes with ankle support and good traction. Water is provided. Call 885-6283 for information. DIG IT. Old Pueblo Archaeology Center, a nonprofit corporation, offers public archaeological field school sessions at the Sabino Canyon Ruin, home of Hohokam Indians 650 to 1,000 years ago. The field school features instruction in archaeological excavation techniques, artifact recovery and care, interpretation of ancient cultures, and archaeological ethics. Lunch is provided. Cost is $69 per eight-hour day, with reduced rates for groups and multiple day sign-ups. Reservations are required 24 hours in advance. Archaeologist guided tours of the ruin are also available. Call 798-1201 for reservations and information. SUMMIT ADVENTURES. Summit Hut. 5045 E. Speedway. 325-1554. The Summit Hut continues its free Spring Evening Outdoor Adventure series with a slide-lecture by Jeffrey Minker at 8 p.m. Friday, April 25. Minker shares his travels experiences in On Top of The World in Tibet: The Land of the Dalai Lama. Call 325-1554 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. 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. COCHINEAL WORKSHOP. Tohono Chul Park presents a cochineal workshop, with entomologist Robin Roche, from 1 to 5 p.m. Saturday, April 26. Roche will discuss this little prickly pear dweller and introduce participants to the beautiful red dyes it produces; including an opportunity to dye a silk scarf. Cost is $15, $20 for non-members, and includes all materials. Pre-registration is required. Call 742-6455 for information. VOLUNTEER CALL. The Nature Conservancy's Ramsey Canyon Preserve is now recruiting and training volunteers for various spring and year-round positions. Interested individuals are invited to attend a free orientation meeting at 10 a.m. Saturday, April 26, or at 4 p.m. Monday, April 28. Sessions are limited to 10 participants. Call 378-2785 for registration and information. Upcoming Q RANCH DIG. The Old Pueblo Archaeology Center is now accepting registration for a field school dig at the Q Ranch Pueblo Indian ruin in Canyon Creek Valley from June 8 through 21. Tuition starts at $15 per day, with options for college credit and skills certification from the Arizona Archaeological Society available. Room and board are available for an additional fee. Call the Old Pueblo Archaeology Center at 798-1201 or the Arizona Archaeological Society at 1-602-488-9793 for registration and information.

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