Dropped by here at the weekend (end of July) and managed to tag along with one of the free tours they have of the area. You can find tour times on their web page. The tours are free!
It was raining but the tour guide, a lady called Karen, was great helping us around even though it was raining. She let us pause the tour as we wanted to shelter in between showers.
She was very knowledgable and also great with the little person we took along (4yr old) answering his questions and engaging all of us.
The bugs were out, so you want to take bug spray. You also want to take quarters for the car park (75c an hour or you could call a number to buy parking time from the car park).
There were some pretty interesting plants there but I have to say, I we even more excited by the birds we saw. Apparently they have bird spotting walks early in the mornings (around 7:30).
A nice little place to visit and certainly soaked my little one in all the right ways. I'll be visiting again once the seasons change a there are different plant cycles to see.