In the heart of Waikīkī, in between the Duke surfing statue and the police station, sit four large stones that represent a Hawaiian tradition of healing and inclusion that is all but unknown to the millions of locals and visitors passing by. According to legend, these boulders honor four mahu—people of dual male and female mind, heart, and spirit—who long ago brought the healing arts from Tahiti to Hawai’i and used their spiritual power to treat disease. The stones were much beloved by Princess Kaiulani, the last heir to the…