Downtown Honolulu (Top Oahu Attractions & Sights), Oahu tours & activities, fun things to do in Oahu | HawaiiActivities.com The center of human activity in all the Hawaiian islands, downtown Honolulu is a bustling city center filled with historic buildings, culturally-significant statues, and other marks of Hawaii's rich past. See the statue of King Kamehameha, built right across the road from Iolani Palace, the only royal residence in the United States. Nearby are the Hawaii State Capitol, as well as other places of interest such as Kawaihao Church, Mission Houses Museum, and the bustling Chinatown.