We have 2 families planning to meet in Cairns for Christmas week and then fly on to Sydney for New Year's week. One family is coming from Perth, the other from California. The adults plan to snorkel and scuba, and the 5 yr olds would enjoy a swim. I've heard the weather is rainy and there are stingers that time of year. Does anyone have any input to help us decide to keep our plans to go to Cairns...or have a recommendation for an alternative for Christmas week prior to Sydney? Thank you!