Part of the NRA membership is a subscription to one of their magazines such as American Rifleman. One of the columns I really enjoy is on entitled Armed Citizen. It is a column dedicated to showcasing self defense stories of citizens around the US.

If you go on their site, you can search by state. There are only a few from Hawaii, here they are:

The Garden Island, Kauai, HI, 12/9/04 
State: HI 
American Rifleman Issue: 12/1/2004 
When some dogs on the loose attacked a horse in Kalihiwai, Hawaii, its owners tried to help the animal escape by opening the gate. However, that led to more dogs entering and attacking the horse. A passerby stopped his car, retrieved a shotgun, and then shot one of the dogs, forcing the rest to flee. "Thank God, the guy came with the gun," said horse owner Doug Gilette. 

West Hawaii Today, Kailua, HI, 9/8/98 
State: HI 
American Rifleman Issue: 1/1/1999 
When a would-be burglar armed with a handgun entered a Waialua, Hawaii, residence intent on robbing the owner, he initially received cooperation--or so he thought. The resident told the home invader that the money was in a backpack. Rather than booty, however, the burglar received a boom when the homeowner pulled a 9 mm handgun and fired two shots. After jumping from a second-floor window, the burglar ran, trailing blood and dropping his own gun. 

The Honolulu Star-Bulletin, Honolulu, HI
State: HI 
American Rifleman Issue: 6/1/1976 
Moments after breaking into policeman Benjamin Jaus' apartment in Honolulu, Hawaii, a burglar found himself staring down the barrel of a service revolver. Jaus turned the crook over to fellow officers, then went back to bed. 

The Honolulu Advertiser, Honoluly, HI 
State: HI 
American Rifleman Issue: 12/1/1971 
Lawrence K.C. Chung, a grocer in Makiki, Hawaii, pulled a handgun after a knife-wielding robber grabbed a customer and demanded cash. Aiming at the robber's head, Chung ordered him to release the customer and drop his knife. When Chung cocked his gun, the robber obeyed and fled.