Infections with the SARS-CoV-2 virus are increasing in Hawai' i at alarming rates . In the absence of a SARS-CoV-2 virus vaccine, the options for control include social distancing, improved hygiene, and face mask use . There is evidence that mask use may decrease the rates of viral transmission . The rate of effective face mask use has not yet been established in Hawai' i . The authors performed an observational study at 2 locations in Honolulu and evaluated outdoor face mask use compliance in 200 people . Simultaneous observations were performed in a downtown Honolulu business area and in Waikiki, an area focusing on tourism . Overall , 77% of all subjects used face masks in an appropriate fashion, covering their nose and mouth, while 23% were either incorrectly masked or not masked . The rate of compliance with correct public mask use in downtown Honolulu (88 %) was significantly higher than in Waikiki (66 %) (P=.0003, Odds Ratio [95% Confidence Interval] =3.78 [1.82 , 7.85] ) These findings suggest that there are opportunities for improvement in rates of public face mask use and a potential decrease in the spread of COVID-19 in our population . Four proposed actions are suggested, including a reassessment of the face mask exemption requirements, enhanced mask compliance education, non-threatening communication for non-compliance, and centralization of information of the public compliance with face mask use.