Not very creative, but the HA web site returns a fare of $470.18 for the itinerary and dates you suggested. Probably won't be available at 2-weeks out. If there's any future chance of using the cancelled ticket (in the event you don't go in April), I'd take the chance. Even if you could get a mileage ticket to OGG at this late date, there would still be a cost involved to cancel and redeposit. IMHO, the risks you run by doing something now are less costly than those you will run by waiting until you know for sure.
[This message has been edited by DLfan (edited Feb 02, 2004).]