Going to Aussie land, need some advise

[Willito]

My wife and I will visit the land under for about 3 weeks and would like to get some thoughts on what to do, see, and experience from people who has done it. We're starting off in Sydney for new years eve celebration and going from there. Obvisiosly, the reef and beach is a must, but which one?? I don't know if we'll be able to learn scuba in time, but are experienced snorklers. Where are some good shallow beaches with close by reefs to go snorkle in?