Just returned from a 7 night stay. There was a large group staying the hotel and it was clear that this was the focus. Loud music until almost 11PM on 2 nights. The room was ok. Nothing special. They charge a "resort fee" and charge for parking and almost nothing is included in your nightly rate.
If you are looking for a Hawaiian vacation, I would stay elsewhere. We found a restaurant at the hotel close by (the Canoe House), went was far superior to anything at the Fairmont.