Welcome to FT, travelbuddy13!
You'll certainly get a lot of advice on this topic, but you may find more relevant advice in either the DL or the US specific forum. Although, you don't want to post the same quesiton in both.
I'll start by offering you this piece of advice ... You should arrange your award flight to AND from HNL. For your return, book a (relatively) inexpensive, one-way 'island-hopper' from KOA to HNL. You will find award availability into and out of HNL on either airline much better than any other airport in Hawaii.
Good luck!