Helicopter rides on the "big" island (Hawaii) would take you over the live volcanos if you take off from Hilo especially.
On Kuai look forward to Waimea Canyon and the Napali Coastline from a helicopter.
On Maui look forward to the beautiful dormant volacano crater of Haliakala.
Oahu, Pearl Harbor, Diamond head and the north shore beaches.
All of course, beautiful ocean, beaches and other sights.
Best place? I don't know if that can be answered.