The Harold L. Lyon Arboretum is nestled in 193.5 acres of tropical rain forest at the top of the Manoa Valley watershed. Just 5 miles from the bustle of Waikiki, Lyon Arboretum serves as a cultural and scientific resource to urban O’ahu’s diverse communities. With over 5,000 taxa of tropical and sub-tropical plants to be found throughout our grounds, over seven miles of hiking trails, and an elevation gradient that starts at 450 feet and rises to 1850 feet above sea level, the Lyon Arboretum has much to offer to all.