Turquoise Trail Guided Walking Tour — Presidio San Agustin del Tucson Museum, 196 N. Court Ave. A historian-docents will lead a walk along the 2.5 mile Turquoise Trail through downtown to see historic buildings and hear stories that make Tucson special. 10 a.m.-12:30 p.m. Oct. 24. $15. 837-8119. OUTDOORS.

OUTDOORS AND ACTIVITIES

All events are free or included in admission or vehicle entrance fee unless otherwise noted. Parking may be additional. Bad weather may change or cancel activity. Children must be accompanied by an adult. No pets unless otherwise specified.

Birding  — Pima County Agua Caliente Park, 12325 E. Roger Road. Take a guided walk to see birds such as warblers, flycatchers, hummingbirds, orioles, and vireos. Loaner binoculars available. Online registration required. 8-9:30 a.m. Oct. 18 and 25. 724-5375.

Hike Yetman Trail — Tucson Mountain Park, Camino de Oeste Trailhead, 400 N. Camino de Oeste. A moderate level, 2-3 mile interpretive hike to the Bowen Stone House ruins area. Ages 12 and up. Online registration required. 7:30-10 a.m. Oct. 18. $5. 724-5375.

Mission Garden —  946 W. Mission Lane. Living agricultural museum of Sonoran Desert-adapted heritage fruit-trees, traditional heirloom crops, and edible native plants. 8 a.m.-2 p.m. Oct. 18-20, 24-26. 955-5200.

Guided Fall Hike — Mt. Lemmon, MP 12 Catalina Highway. This is a moderately difficult 5.6 mile guided hike with an elevation gain of 1300 feet to Guthrie Peak from General Hitchcock trailhead. Led by Sabino Canyon Volunteer Naturalists. Children under 18 must be accompanied by an adult. Meet at the McDonalds at Tanque Verde and Catalina Highway to carpool up the mountain. 8 a.m.-1 p.m. Oct. 19. 429-4492.

Nuts about Nature Preschool Hour  — Pima County Agua Caliente Park, 12325 E. Roger Road. Join us for child-friendly fun to learn about nature through stories, crafts, and games. Children ages 3-5 with an adult companion. Online registration required. 10:30-11:30 a.m. Oct. 19. 724-5375.

Anza Day  — Historic Canoa Ranch, 5375 S. I-19 Frontage Road, Green Valley. Join in the festivities at the Grand Opening and Dedication of Canoa Lake and the 50th Anniversary of the National Trails System. Food, vendors, music, dance performances, presentations, 4H exhibitors, and horseback rides. 9 a.m.-3 p.m. Oct. 20. 724-5220.

Dragonfly Biology Workshop — Pima County Agua Caliente Park, 12325 E. Roger Road. Workshop begins with a classroom introduction to the biology, classification, and identification of these remarkable animals. Following a short bring your own lunch break, we will head to the ponds to see what species we observe and practice our newly acquired identification skills. Online registration required. 9 a.m.-1 p.m. Oct. 20. $15. 724-5375.

Guided Bird Walk — Tumacacori National Historical Park, 1891 E. Frontage Road. A guided walk up to 3 hours or as long as the birds are active. Suitable footwear and bring water. Binoculars available for loan. 8:30-11:30 a.m. Oct. 20. 377-5060.

Historic Craft Demonstrations — Tumacácori National Historical Park. Traditional tortilla-making on the mission grounds. 10 a.m.-4 p.m. Oct. 20 and 21. 377-5060.

Historical Tour  — Pima County Agua Caliente Park. Enjoy a guided walk around the lush grounds and historic buildings to gain insights into the rich farming and ranching history of the site. Registration not required. 9-10 a.m. Oct. 20. 724-5375.

History Hike: Millville Ruins and Petroglyph Trail — Millville Ruins, Charleston Road, Sierra Vista. Led by The Friends of the San Pedro River. History Walk. 9-11 a.m. Oct. 20. Donations appreciated. 459-2555.

San Pedro River Walk — San Pedro House, 9800 E. Highway 90, Sierra Vista. Led by he Friends of the San Pedro River. Interpretive walks. 9-11 a.m. Oct. 20. Donations appreciated. 459-2555.

Sonoran Desert Weedwackers — Pima County Tucson Mountain Park, Pima County Tucson Mountain Park. Join the Sonoran Desert Weedwackers to eradicate buffelgrass and fountain grass in Tucson Mountain Park. Work requires hiking and digging buffelgrass on steep slopes. Meeting locations change frequently. Email education@pima.gov for meeting location. Ages 18 and up. 7-11 a.m. Oct. 20. 724-5375.

Bird Walk — Environmental Operations Park, Hwy. 90 east of Sierra Vista. Led by docents from Southeastern Arizona Bird Observatory and the Friends of the San Pedro River. A 50-acre wetlands planted with aquatic plants, including cattails, and grasses that attract migrating and nesting birds. First come first served basis.  Suitable footwear and water. 7-10 a.m. Oct. 21. Donations accepted. 459-2555.

Membrillo Fest — Mission Garden, 946 W. Mission Lane. Learn how to make the traditional Sonoran-style cajeta de membrillo (quince bar dessert) from "Madrina del Jardín" (Garden Godmother) Josefina Lizárraga. Food, refreshments, and live music. 3-5 p.m. Oct. 21. Donations accepted. 955-5200.

Petanque in the Park — Reid Park, 830 S. Country Club Road. Learn and play the French game of petanque. 2-4 p.m. Oct. 21. 664-4133.

Sonoran Lifestyles — Saguaro National Park East, 3693 S. Old Spanish Trail. A two hour, one mile walk to discover how plants and animals adapt to life in the desert. 10 and up. 10 a.m.- noon. Oct. 22 and 24. 733-5153.

The Adventures of Thelma the Tortoise — Saguaro National Park East. Talk by park volunteer. 2-2:45 p.m. Oct. 22. 733-5153.

Birding  — Gabe Zimmerman Davidson Canyon Trailhead: Cienega Creek Natural Preserve, 16000 E. Marsh Station Road, Vail. A guided walk to observe the rich birdlife in the desert and riparian habitats as we search for migrant and resident birds. Online registration required. 8-10 a.m. Oct. 23. 724-5375.

Birding Maeveen Behan Desert Sanctuary — Arthur Pack Regional Park, 9101 N. Thornydale Road. Take a guided walk on flat trails through saguaro-ironwood desert habitat to see a variety of upland birds as well as waterbirds on the adjacent ponds. Loaner binoculars available. Online registration required. 7-9 a.m. Oct. 24. $5. 724-5375.

Full Moon Wander — Pima County Agua Caliente Park, 12325 E. Roger Road. Join a Pima County naturalist to walk the gentle trails of Agua Caliente Park as the sun sets and the full moon rises. Suitable footwear, dress for weather, bring water and a flashlight. Ages 12 and up. Online registration required. 6-8 p.m. Oct. 24. 724-5375.

Bird Walk — San Pedro House, 9800 E. Highway 90, Sierra Vista. Sponsored by the Friends of the San Pedro River. 8-10 a.m. Oct. 24. 459-2555.

Turquoise Trail Guided Walking Tour — Presidio San Agustin del Tucson Museum, 196 N. Court Ave. A historian-docents will lead a walk along the 2.5 mile Turquoise Trail through downtown to see historic buildings and hear stories that make Tucson special. 10 a.m.-12:30 p.m. Oct. 24. $15. 837-8119.