Consider visiting the historic Iolani Palace in Honolulu. Built in 1882 by King Kalakaua, Iolani Palace was the home of Hawaii’s last reigning monarchs and served as the official royal residence and the residence of the Kingdom’s political and social life until the overthrow of the monarchy in 1893. It requires tickets, which are best bought in advance. Limited number of visitors per day.
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Pali Overlook. Five miles outside of Honolulu. Free. Magnificent view.
Pali Lookout - Nuuanu, Oahu | GoHawaii.com