I didnt really look for the night life, I was there with my GF of the time... we had spent the first part of the week on Oahu on which there is plenty to do at night.
If you can, you should meet some locals and get in on a late night beach party. Or make your own.
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I just googled it and it says one of the 2 best late night spots is actually in the Hyatt... It must not have been opened yet when I was there.