He was called "a voice for the Hawaiian wilderness," a "Guardian of the Koke'e Forest," and as an educator, "the window through which thousands of Hawai'i students learned about Hawaiian birds, plants, marine creatures, climate and much more." Boynton photographed a bird now believed extinct, the ʻŌʻōʻāʻā (Moho braccatus). He recorded the mating call of the single male, whose mate presumably did not survive Hurricane Iwa at the end of 1982. The bird, probably the last of its species, was tending an empty nest.
Boynton used this poignant recording and story to inspire Hawaiian school children in the traditional Hawaiian values of kuleana, malama, kokua, laulima, ho‘ihi, lokahi, and pono, which translate roughly as rights and responsibilities to the land, the appropriateness of serving nature, helping others, cooperation, respect, peace and unity, and duty to do what is right.
Naturalist and teacher
Early life and education
David Spalding Boynton, born and raised in Oahu, graduated from the Punahou School in Honolulu in 1963, where his alumni profile says he "would rather have been in the ocean than in the classroom." Boynton graduated from the University of California-Santa Barbara in 1967 and returned to live in Hawaii.
He was appointed the environmental resource teacher for Kaua`i School District after 18 years as a teacher at Waimea High School. In 1992, David was honored by the Koke‘e Natural History Museum with the “One Person Can Make a Difference” award. Boynton was instrumental in the creation, by the state Department of Education, of the Koke‘e Discovery Center in 1994, a "groundbreaking"  overnight outdoor education facility and student-teacher resource center for fourth and fifth graders in Koke'e State Park, where he served as Director. Boynton claimed that Koke'e and surrounding wilderness areas contained many endangered species, over 400 different native plants, and the greatest concentration of ‘single-island endemics’ anywhere, making it the ideal place to teach about biodiversity, sustainability and environmental stewardship. The David S. Boynton Educational Grant was established in his memory. Grants, for projects supporting the values Boynton taught, up to a maximum of $1,500 each are awarded to educators or students. The first grant was awarded in 2009.
Boynton was a much-published author or co-author of photographic essays of Hawaii. Among his books are:
- Na Pali: Images of Kauai's Northwest Shore (2007)
- Kauai (2006)
- Flowers-Images from Hawaii's Gardens (with his wife, Sue Boynton) (2006)
- Kilauea Point and Kauai's National Wildlife Refuges (2004)
- Kauai, the Garden Island: A Pictorial History of the Commerce and Work of the People (with Chris Cook) (1999)
- The Kaua'i Movie Book (with Chris Cook) (1996)
- Kaua‘i Days (2005)
- Discover Hawaii’s Forests (2000)
- Capturing Hawaii: Kauai (1998)
- Hawaii Humpback Vol. 1 (1980)
- Kaua`i: Ancient Place Names and Their Stories (1998) (with Frederick Wichman)
- By Wind, By Waves (with David L. Eyre) (2000)
In addition, his photographs have been reproduced in countless magazines, newspapers, and posters. Boynton assisted in the production of the Emmy award-winning 1991 National Geographic Special documentary film, “Hawaii: Strangers in Paradise.”
Death in 2007
Boynton's body was found in February, 2007 at the foot of a 300-foot cliff on the north face of the remote Miloli'i Valley of the Na Pali coast, by all evidence the victim of an accident on the difficult trail. It was reported that Boynton had been alone en route to photograph sea turtles on Miloli'i Beach. He was familiar with this rugged trail and terrain. He told a journalist in 2006, "There is a fern that grows in thick mats along these ridges, and I know from personal experience that you can try to push your way through this green layer and wind up stepping off into air."
- TenBruggencate, Jan (February 12, 2007). "David Boynton was nature buff". The Honolulu Advertiser. Retrieved 22 January 2010.
- Thenabadu, Shiyana. "Alumni Profile: David Boynton '63 Guardian of the Koke'e Forest". Punahou High School. Retrieved 22 January 2010.
- "Kauai Oo Moho braccatus". Birdlife International. Retrieved 24 January 2010.
- Coleman, Loren (February 12, 2007). "Extinct Bird Naturalist Dies in Menehune Valley". Cryptozoology News. Retrieved 22 January 2010.
- "Ulukau Hawaiian Electronic Library". University of Hawaii Press. Retrieved 22 January 2010.
- Gregg, Amanda C. (February 12, 2007). "David Boynton’s legacy to live on". THE GARDEN ISLAND. Retrieved 22 January 2010.
- "Stepath receives Boynton grant". The Garden Island. September 11, 2009. Retrieved 22 January 2010.
- Sohn, Tim (November 2006). "A fateful trek into the Hawaiian jungle". Outside Magazine. Retrieved 22 January 2010.