We had a great time here in October. The rooms are great, especially, the ones with an ocean view. Room 808 has got, possibly, the best views of the Hanalei bay.
They have an awesome French restaurant and it's not a bad idea to do brunch here while enjoying the views. The beach was pretty good too. The only complaint I got is that valet parking is the only option here. I don't mind the service but on Kauai it seems out of place to pay $30+tips for parking every day.
SPG stays always get a special treatment and they took good care of us. I'd love to stay here again next time.