The Donald E. Davis Arboretum is managed by the Auburn University College of Sciences and Mathematics. The arboretum has several collections of plants native to Alabama, including a collection of native carnivorous plants and a coastal dune collection. When I was there in October 2016, several of the trees were wrapped for a yarn bomb exhibit.
Address: 181 Garden Drive, Auburn, AL 36830
Approximate miles of trails: <1
Hours: Sunrise to sunset
Trail surface: Natural
Guidebook mentions: Chapter 104 in Exploring Wild Alabama (1st edition)
Interpretive signage, including Audubon in the Arboretum