We've been coming here at least once a year since 2005 and used to love it. Don't want to sound too much like a cranky old man, but it's turned into a multi-generational family reunion / frat party destination over the years and no longer holds any attraction for us (an older couple who come to Kaua'i for peace, quiet, and relaxation). There is constant noise - slamming doors, kids screaming and running in the hallways, etc.- from roughly 6AM on every day. And nowadays it seems a lot of guests start drinking early in the morning. We've seen younger people walking to the beach with beers while we're on our way to breakfast on more than one occasion. Also, there seems to be no restriction on glass (beer) bottles by the pool and beach despite the fact that most everyone in the area is barefoot and using concrete walkways. Or, maybe it simply doesn't occur to the new generation of guests that this is a bad idea. At any rate, it's a lawsuit just waiting to happen. Even if you can ignore the potential danger of broken bottles, with Bluetooth technology days at the beach are now often wireless boom box competitions - which can not be ignored. Add the constant cellphone conversations (why do so many people think they must shout to be heard on the phone?) and it sometimes seems hard to hear the ocean. Another discouraging new development is smokers ignoring the overall smoking ban and the designated smoking areas. A lot of people are now happy to fire up wherever they please and wait to see if hotel staff come by to tell them to put it out. Which isn't likely to happen. Evenings grow noisier every year as large groups traveling together gather outside to party. And these parties now routinely ignore the 10PM 'curfew'. There have been people whooping it up well past 11PM almost every night since we got here.
On the plus side, if you're still interested in coming, the fish tacos at the Honu Bar are out of this world, a complete kitchen and washer and dryer in each unit are really handy, and the staff are genuinely friendly. The Waiohai is also convenient to lots to do and the beach is the best on the south shore. Surfers and whales, in season, are fun to watch, and the pools are nice.
Bottom line, if you're young, traveling with family or friends, like crowds, noise - lots of noise - and parties, the Waiohai is right up your alley. If you're looking for peace and quiet and an escape from the madding crowds, you should look elsewhere. The Ko'a Kea next door (where we're moving to) comes to mind.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.