We'll be in Waikiki during Christmas this year, and we're wondering whether the water temperature will be warm enough to swim and snorkel comfortably. Is the weather around that time likely to be sunny, cloudy, or rainy? We've visited the various Hawaiian islands many times in the past, but never in winter time. When we were at Oahu and Maui this summer (August), the water was just right, cool enough to be refreshing and warm enough to stay in for hours.
Also, is there any "can't miss" special events/activities going on during Christmas that we should plan for?