Arriving the night before is not a bad thing. It will give you time to rest and adjust to any time change.
Go to Pearl Harbor. Go early in the morning as there are lines and tours are first come first served. You will not regret spending this time.
If you have some additional time, you might want to go to Bishop Museum. There is so much more to see , but your time constraint limits you a bit. You may be able to book a tour through your hotel that is a half
day that accomplishes what I recommended above.