If you fancy big things.
There is a Big Prawn at Ballina. It is faded and sad and will probably be knocked down soon so you should get a photo.
I like the Big Avocado because it looks just like a pair of saggy tits by the road.
There is a Big Macadamia at the sunshine coast.

Byron is the most Easterly point in Australia. You could stop so you say you've been.

Some things are seasonal - whale watching is good if it is the right time of year.