Oahu

Lyon Arboretum – University of Hawaii @ Manoa - http://www.hawaii.edu/lyonarboretum/

Honolulu Botanical Gardens - http://www1.honolulu.gov/parks/hbg/

Waimea Valley Arboretum & Botanical Gardens - waimeavalley.net/

Hawaii Island

 University of Hawaii-Hilo Botanical Gardens – 200 West Kawili Street, Hilo

 Hawaii Tropical Botanical Garden - 27-717 Old Mamalahoa Highway, Papaikou, Island of Hawaii, HI 96781 - http://www.htbg.com/

Pua Mau Place Arboretum & Botanical Garden – 10 Ala Kahua, Kawaihae, Hawaii – (808) 882-0888  
http://www.puamau.com/

Maui

Kula Botanical Garden - 638 Kekaulike Avenue, Highway 377, Kula, Maui, HI 96790

Maui Nui Botanical Gardens - 150 Kanaloa Ave. Kahului, HI 96732 – (808) 249-2798
http://www.mnbg.org/contact.html

Kauai 

Na Aina Kai Botanical Gardens -  4101 Wailapa Road, Kilauea, HI 96754 – (808) 828-0525
http://www.naainakai.org/

Princeville Botanical Gardens – (808) 634-5505 - http://kauaibotanicalgardens.com/

National Tropical Botanical Garden -4425 Lawai Road, Koloa, Kauai 96756 – (808) 742-2623
http://ntbg.org/index.php