Located on the Hawaiian island of Oahu, Honolulu is a beloved holiday haven. The spectacular city is home to attractions such as Hanauma State Park, Pearl Harbor National Memorial, and, of course, Waikiki. Some consider this neighborhood one of many tourist traps to skip when visiting Hawaii, but there’s a magnificent hidden gem in Honolulu only about 20 minutes away from Waikiki in Mānoa Valley: Harold L. Lyon Arboretum, also known as Lyon Arboretum. This underrated destination was founded in 1918 and is run by the University of Hawaiʻi.