Thanks everyone, much appreciated!
Separately, we're scheduled to arrive HNL at quarter past midnight, so one option presumably available to us would be to hang around at the airport for a few hours and catch an early flight directly to whichever island we choose. This would mean one less check-in/out of accommodation.
And though I get it that YMMV, does anyone have any thoughts on why that might be a good idea, or not, and why?