Answer:

OAHU

Answer	Crossword Clue
OAHU	Kauai neighbor
OAHU	Pearl Harbor locale
OAHU	Diamond Head island

OAHU	Honolulu's island
OAHU	Diamond Head locale
OAHU	Former Sandwich Island
OAHU	Pearl Harbor island
OAHU	Hawaiian island that sounds sort of like a gleeful cry
OAHU	Sunset Beach island
OAHU	Where "The Descendants" was shot
OAHU	Location of Makapu'u Lighthouse

OAHU	Pearl City setting
OAHU	Diamond Head's setting
OAHU	Waikiki's whereabouts
OAHU	Pacific island
OAHU	Diamond Head isle
OAHU	Pearl Harbor's island
OAHU	Home of Iolani Palace
OAHU	Pearl Harbor's home

OAHU	Filming site for "Lost"
OAHU	Waikiki's island
OAHU	Where to find Hickam Air Force Base
OAHU	Home to Honolulu
OAHU	Kaneohe isle
OAHU	Diamond Head home
OAHU	Kaala is its highest peak
OAHU	USS Arizona Memorial's location

OAHU	Site of James Dole's pineapple plantation
OAHU	Most populous Hawaiian island
OAHU	Diamond Head's location
OAHU	Pearl Harbor site
OAHU	Location of the first Ironman Triathlon
OAHU	Diamond Head's island
OAHU	Iolani Palace locale
OAHU	Island near Kauai

OAHU	Waikiki locale
OAHU	"Hawaii Five-O" locale
OAHU	Diamond Head's locale
OAHU	Honolulu's home
OAHU	Pearl City locale