You’d be driving right into peak rush hour at 4:30 (assuming its a weekday). If you feel safe leaving luggage in your rental car early dinner wouldn’t be the worst idea, theres not a whole lot of options near by...and most are fast food type options...there’s a few like ruby tuesday near by, but not really much in the way of places most would like to eat at when in hawaii.
It can be a tough choice to decide between leaving luggage in a car for an hour +, or driving for 2 hours or so in stop and go traffic (mostly slower than 15 mph).
You could also try doing a scenic route drive (head for the h-3 to kaneohe, then drive up through kahuku, north shore, etc. before turning back towards mililani and then towards aulani.) it’ll take longer but at least the scenery will be much nicer...and theres a good chance you won’t see much traffic...just a longer drive. Just gotta be sure theres no road closures that could turn a nice scenic drive into a traffic nightmare.