We are traveling in Australia in mid March - meeting our daughter and boyfriend who will want to dive, we would like to snorkel. We will have 1 week along the east coast - and will fly in and rent a car. What are the highlights north of brisbane - know we can't get as far as Cairns, but would like to try to hit the highlights of sea and land. Can anyone give us some tips? My daughter is 25, and we are active 50 yo. Thanks very much!