History Walk — Presidio Santa Cruz de Terrenate, In Balance Ranch Road, Sierra Vista. A 3 mile walk with The Friends of the San Pedro River to learn what happened there to make the Spanish abandon the fort in 1780. Suitable footwear. 10 a.m.-1 p.m. Dec. 16. Donations accepted. 459-2555. Outdoors.

History Walk: Presidio Santa Cruz de Terrenate

OUTDOORS

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.

A Gneiss Walk — Sabino Canyon, 5700 N. Sabino Canyon Road. Enjoy a walk and talk about the geology of the canyon led by a Sabino Canyon Volunteer Naturalist. 8:30-11 a.m. Dec. 14 and 21. 749-8700.

Birding  — Pima County Agua Caliente Park, 12325 E. Roger Road. A guided walk through the park and along the ponds to view raptors, sparrows, and many other birds. Ducks should be arriving for the winter. Loaner binoculars available. Online registration required. 8:30-10 a.m. Dec. 14 and 21. 724-5375.

Walking Tour — Presidio San Agustín del Tucson Museum, 196 N. Court Ave. Includes a tour of the museum, lunch at La Cocina Restaurant, and a tour of the historic buildings at the Tucson Museum of Art. Cost includes lunch. Attendees must register and pay in advance at TucsonPresidio.com. 10:30 a.m.-1:30 p.m. Dec. 14. $45. 837-8119.

Walk With The Saguaros — Saguaro National Park East, 3693 S. Old Spanish Trail. Join a naturalist for this two hour easy walk to discover the many fascinating facts about the saguaro cactus. Suitable footwear. 10 a.m.-noon. Dec. 14 and 21. 733-5153.

Cactus Caravan — Saguaro National Park East. Explore the forest with a park ranger. 11 a.m.-12:45 p.m. Dec. 15. 733-5153.

Is it A Cactus or A...sparagus — Saguaro National Park East. Come learn the difference between the two most famous families of desert plants on this short stroll in the cactus garden. 2-2:30 p.m. Dec. 15 and 22. 733-5153.

Nuts about Nature Preschool Hour — Roy P Drachman-Agua Caliente Park, 12325 E. Roger Road. Learn about nature through stories, crafts and games. Ages 3-5 with an adult. Register online. 10:30-11:30 a.m. Dec. 15. $5. 724-5375.

Stargazing at Whipple Observatory —  670 Mt. Hopkins Road, Amado. Come before dark to enjoy a presentation followed by stargazing at Fred Lawrence Whipple Observatory. 5-8 p.m. Dec. 15. 724-5220.

A Night Under the Stars — Tucson Mountain Park, Ironwood Picnic Area, 1500 S. Kinney Road. Tucson Amateur Astronomy Association volunteers provide an introduction to the night sky. Telescopes for viewing. Bring a chair. 6-8 p.m. Dec. 16. 724-5375.

Birding  — Sweetwater Wetlands, 2511 W. Sweetwater Drive. Roam this urban birding hotspot with a naturalist to look for wetland and desert birds as well as other wildlife. Online registration required. 4:30-6:30 p.m. Dec. 16. 724-5375.

D-SLR Photography Workshop — Saguaro National Park East. Join park staff and photographer Alan Johnson for a 2-hour workshop covering the basics of digital SLR photography and an opportunity to practice shooting on the scenic trails of Saguaro National Park. Reservations required. 2-4 p.m. Dec. 16. 733-5153.

Family Nature Walk — Sabino Canyon. Easy trail walk for the entire family lead by Sabino Canyon Volunteer Naturalist. 8:30-10:30 a.m. Dec. 16. 603-2912.

Historic Craft Demonstrations — Tumacácori National Historical Park, 1891 E. Frontage Road. May include, tortilla making, paper flower making, pottery, or O’odham basket weaving, or other art forms. 10 a.m.-4 p.m. Dec. 16 and 17. 377-5060.

History Walk — Presidio Santa Cruz de Terrenate, In Balance Ranch Road, Sierra Vista. A 3 mile walk with The Friends of the San Pedro River to learn what happened there to make the Spanish abandon the fort in 1780. Suitable footwear. 10 a.m.-1 p.m. Dec. 16. Donations accepted. 459-2555.

River Walk — San Pedro House, 9800 E. Highway 90, Sierra Vista. The Friends of the San Pedro River will conduct interpretive walks to find 82 species of mammals, dozens of reptiles and amphibians and nearly 350 species of birds. Suitable footwear.  9-11 a.m. Dec. 16. Donations accepted. 459-2555.

Sonoran Desert Weedwackers — Tucson Mountain Park. Help to eradicate buffelgrass and fountain grass. Work requires hiking and pulling buffelgrass on steep slopes. Email eeducation@pima.gov for meeting location. Ages 18 and up. 8-11 a.m. Dec. 16. 724-5375.

Turquoise Trail Guided Walking Tour — Presidio San Agustín del Tucson Museum, 196 N. Court Ave. A 2.5-mile walking tour of downtown Tucson that leads walkers past many architectural and artistic gems important to Tucson’s history. Suitable footwear. Tour not recommended for young children. 10 a.m.-12:30 p.m. Dec. 16. $15. 837-8119.

Bird Walk — Environmental Operations Park, Hwy. 90 east of Sierra Vista. A two hour walk led by docents from Southeastern Arizona Bird Observatory and the Friends of the San Pedro River. Suitable footwear. First-come, first served basis. 8-11 a.m. Dec. 17. Donations accepted. 459-2555.

Desert Botany 101 — Saguaro National Park East. An easy walk through the cactus garden. 10-10:30 a.m. Dec. 17. 733-5153.

Duck ID Class — Pima County Agua Caliente Park, 12325 E. Roger Road. Join Jeff Babson to learn the intricacies of identification and examine the ducks of southern Arizona. Ages 12 and up. Online registration required. 10 a.m.-noon. Dec. 17. $15. 724-5375.

Hidden Wildlife — Saguaro National Park East. Learn to look for the signs that animals leave behind. 3-3:30 p.m. Dec. 17. 733-5153.

Petanque in the Park — Reid Park, 830 S. Country Club Road. Learn and play the French game. 2-4 p.m. Dec. 17. 664-4133.

The Giant Cactus — Saguaro National Park East. Join a ranger for a walk along a desert wash for a lesson in trees of the desert and a look at the only tree-like cactus in the U.S. Suitable footwear. 11 a.m.-12:30 p.m. Dec. 17. 733-5153.

A Taste of the Desert — Saguaro National Park East. A walk to learn what plants can be used for food, clothing, medicine and shelter. 11-11:30 a.m. Dec. 18. 733-5153.

Desert Adaptations — Saguaro National Park East. Discover the fascinating world of desert plants and the many techniques used to live here. 3-3:30 p.m. Dec. 18. 733-5153.

Sonoran Lifestyles — Saguaro National Park East. A 2 hour, 1 mile walk to discover how plants and animals adapt to life in the desert. Ages 10 and up. 10 a.m.-noon. Dec. 18 and 19. 733-5153.

Birding Cienega Creek — Gabe Zimmerman Davidson Canyon Trailhead, 16000 E. Marsh Station Road, Vail. Join Jeff Babson on this guided walk to observe hawks, tanagers, warblers, sparrows, and many others. Online registration required. 8-10 a.m. Dec. 19. 724-5375.

Tour of Historic Canoa Ranch — Historic Hacienda de la Canoa, 5375 S. I-19 Frontage Road, Green Valley. Join a walking tour of the ranch headquarters, historic buildings, corrals and exhibits. Online registration required. 10-11:30 a.m. and noon-1:30 p.m. Dec. 19. 724-5220.

Desert Morning Hike — Saguaro National Park East. Join a park naturalist on this fitness hike. Suitable footwear. 9 a.m.-noon. Dec. 6. 733-5153.

History of the Rincon Valley — Saguaro National Park East. A walk to learn about the homesteaders and ranchers who settled. Suitable footwear. Ages 10 and up. 10 a.m.-12:30 p.m. Dec. 20. 733-5153.

Nature Walk: Plants and Wildlife — Sabino Canyon. Easy trails led by a Sabino Canyon Volunteer Naturalist. Meet at the flagpole in front of the Sabino Canyon Visitor Center. 8:30-11:30 a.m. Dec. 20. 749-8700.

Bird Walk — San Pedro House, 9800 E. Highway 90, Sierra Vista. Sponsored by the Friends of the San Pedro River. Suitable footwear. 9-11 a.m. Dec. 20. Donations accepted. 459-2555.

Who's Who — Saguaro National Park East. A walk through the cactus garden. 3-3:30 p.m. Dec. 21. 733-5153.

Night Walk — Saguaro National Park East. Join a park naturalist to experience the Sonoran Desert at night. Reservations required call 733-5153. 7-9 p.m. Dec. 22. 733-5153.

The Saguaro Time Hike — Saguaro National Park East. A 1.6 mile hike with one small hill climb. Ages 10 and up. 11 a.m.-1 p.m. Dec. 22. 733-5153.