Lyon Arboretum is nestled in 193.5 acres of tropical rainforest at the top of the Manoa Valley watershed. Just 5 miles for the bustle of Waikiki, Lyon Arboretum serves as a cultural and scientific resource to urban & diverse communities. With over 5,000 taxa of tropical and sub-tropical plants to be found throughout our grounds, over seven miles of trails and elevations from 450 to 1850 feet above sea level, the Lyon Arboretum has much to offer to all.