Lyon Arboretum
Tucked all the way back in Manoa Valley, this is a gem of an arboretum operated by the University of Hawaii. Reservations are required to visit its almost 200 acres, where you can hike to a waterfall or sit and enjoy beautiful views of the valley while having a picnic. You'll also see an ethnobotanical garden, a Hawaiian hale (house) and garden, and one of the largest palm collections anywhere—all within a parklike setting. The arboretum's educational mission means there are often regular talks and walks, plus classes on lei-making, lauhala weaving, Hawaiian medicinal arts, and more, which you can take for an additional fee.
