For our no kids couple vacations, Hawaii anytime in the summer or during any US school holiday is off limits. One of our favorite trips was our first pre-kids trip to Hawaii to the old St. Regis Princeville and Grand Hyatt Kauai in late winter. We loved it so much we went back as a couple again the following July and the places could not have been more different. Yes, there were a lot more kids, but everything was just way more packed in general. The next time we went in the summer we took our kids and it was great. Hawaii is amazing (its just amazing in different ways at different times of the year). It sounds like this might have been even a little crazier than usual, but there's only so much that adult pools can do and it's usually the restaurants and beach areas where there's no way to avoid it.