Ouch...well, don't know if they have any alternative dishes or not. Love 'Ohana, but would worry about bringing my veggie friends there. There is a HUGE grill in the center of the place, with tons of meat roasting away on skewers in plain sight. The whole place smells (deliciously) like meat.
If you aren't offended by meat, I'm sure they can accomodate you (I have heard of them getting things for kids like fries and stuff from Kona next door, I'm sure they'd do the same for you), but just be forewarned that there is a LOT of meat at 'Ohana, and you will be fending off people trying to put it on your plate (there are several different servers who will bring it 'round to offer you).
Just wanted to give you a warning in case you are sensitive to the appearance/presence of meat, as opposed to simply not enjoying eating it.
Can you tell I know a lot of what I affectionately call "granola hippies"?

I got chewed out once because the ketchup bottle accidentally touched the BUN that a hamburger was attached too, LOL.
N.E.D.