Hi. I'm gong to Aus for the first time to visit my son in Sydney. I've also booked a flight up to Cairns to stay for a week. I have been told to stay in Port Douglas but there seem to be great hotels on various islands. I would like to do some snorkelling. I wondered if anyone had any suggestion, hints, tips for places to stay and trips 'not to be missed'. Any suggestions gratefully received. Thanks.