There is the Kaneohe HPU location & the downtown one.
Living on the Windward side (Kaneohe location) is safe in general, except maybe for Waimanalo
Downtown, I would stay away from Chinatown at night time, day time is fine, except for the crack head homeless that venture out during the day.
General places to stay away from are Kalihi, Waipahu, Waianae, Ewa Beach.
The general rule is, if it's ghetto, avoid it.
Other than that, Honolulu Hawaii (the capital of HI) is rated the best quality of life to live in the USA
http://www.aroundhawaii.com/assets/articles/2007/06/864/images/juliet_swim_zed1_copy.jpg
Oops sorry, wrong link, that was my friend at HPU (dreaming).
Honolulu, #29 in the world, but #1 in the US
http://www.mercer.com/qualityoflivingpr#city-rankings