Love it when kids from good neighborhoods try to give you advice about bad ones. Listen, there isn't anything you can do without getting them all riled up and yourself potentially injured. You're right, these folks wear bucking a decent way of life like a badge of honor. What do you think they wear on their sleeve for roughing up a haole?
Yeah, most of the responses I've seen in here amount to "dude, why don't you just invite them over to use your pool?" And nobody seems to realize that Hawaii is largely a shithole. You don't need to do something to become a victim there, just ask tourists who get mugged and beaten routinely just for leaving the safety of their hotel. If it wasn't a beautiful island, white people would go there about as often as Oakland.
Don't take the advice of anyone telling you to get revenge. It's not gonna end pretty for you, because you have something to lose and they don't. Your best course of action is no action until you can get the hell out of there. Pride will tell you otherwise, but self-preservation is a much better speaker.
You don't want to start anything with them...ever seen Hot Fuzz?? Shit would go doooooown....
Wait a sec, I saw that one George Clooney movie about him in Hawaii and a cheating wife and such and it was all pastries and unicorns for everyone involved (apart from the wife; she dies. Spoilers, btw.). Either Hawaii is full of affluent white people driving around in convertibles and jetski's, or the movies...they lie.