Try a Travelocity Dream Map with OGG as your hometown. (Try HNL, too.) That'll show you the reverse prices (Hawaii outbound). It's imprecise for a couple of reasons, but it should point you in the right direction. towards some fare sales.

Also note that AA is currently running MCI to Hawaii (incl. OGG) for around $500 R/T - about as low as I've ever seen it out of KC (not sure of dates).

See if you can get something like that before you use FF miles to get to the West Coast to catch a $350 R/T flight.