I had both ceremony and reception at the Prince Waikiki. I opted not to have my reception in the ballroom however, as I wanted a smaller party. So this review is more for the Muliw...ai Deck, where the ceremony was located.
It was a nice and breezy in February and thank goodness for no rain. The deck is semi covered on the mountain side of the 4th or 5th floor (it's been a few weeks so I don't remember). It may be a problem if there are heavy rains, but they are equipped to move the ceremony indoors, should that happen. Another thing is, there is a bit of distance from the elevators to the deck, so if there's a light drizzle, your guests will be fine under the cover of the deck, but make sure you have an umbrella handy when you're walking to and from the elevators. You don't want to mess up that hair & makeup you just paid hundreds for.
There was a turnaround of some kind with the banquet/event planning staff. The Catering & Conference Services Manager that I initially started emailing & met with was not the same point of contact that I was emailing leading up to the wedding and on the day of. Both were a pleasure to work with and had great customer service, but some brides might find that nerve wracking.
My one big negative is that they do not have a bridal room for the bride and party to get ready. If you want to get ready on site, you will have to book a room. I didn't find it too big a deal, but some might.