Start reading on flyertalk. It is helpful to know your planes, seats, and all.
Coming back from HNL is pretty much always a redeye. Not so many lie flat seats offered, and those now are so freaking hard to get with miles or cash (I've taken my kids back 9 times and always use miles - never paid but sometimes go coach which is brutal from BWI/DCA/IAD, god forbid IAD). Start looking at 330 days out. There are sites to follow to check - also help is there with The Points Guy and
http://pointspros.com/. I've emailed them both, but honestly the amount of booking I've done they can't even help me, LOL!
I can use Delta (not my favorite) through ATL with lie flat seats, but now it's gone from 75K round trip (if you're lucky) to 150K one way. Um, nope.
United has lie flat seats to Dulles - I have no miles or anything with them. I can transfer from SPG but it's not good.
At the very least, do some sort of comfort plus coming back. It's just not fun.
Also go on Seatguru to look at seat maps!
There is no difference between first and business class on these flights - for the most part it's either first or coach.
I've done this trip so many times. Also lived on Oahu so flew back to the mainland a few times.
I wish you well! It is helpful to do research and start checking at 330 days.