The term DIAMOND HEAD LOCALE refers to the area around Diamond Head, a volcanic tuff cone located on the Hawaiian island of Oahu. The four solutions to the crossword are OAHU (4 letters), WAIKIKI (7 letters), UMP (3 letters), and LIL (3 letters). Oahu is the third largest of the Hawaiian Islands and is home to the capital city of Honolulu. Waikiki is a neighborhood of Honolulu located on the south shore of Oahu. UMP stands for the University of Hawaii at Manoa, which is located in Honolulu. Lastly, LIL stands for the nearby town of Kailua, which is located on the windward side of Oahu.