You need more miles if you want three seats together.The Delta awards will be tough, especially since they rarely release space at 330 days like AA/UA. Read up on searching for Delta low awards segment-by-segment. I've been following Delta award space from LAX-all Hawaii this summer (albeit in coach) and availability since Dec has been pretty much nonexistent.

Just checked and I don't see a single low seat from LAX to either LIH/OGG all calendar, and that's with extended (Silver) elite availability, which has helped for all of the awards I have redeemed so far (if the "I'm Traveling" checkbox is to be believed).