The gardens have teamed up with the National Dinosaur Museum to create DinotraX - a discovery trail showcasing life-size dinosaur sculptures, living fossil plants and winged monsters.

Gardens ranger Ben Harvey said the display would take people back to Gondwanaland 100 million years ago.

"DinotraX gives visitors an incredible glimpse into the variety of dinosaurs that roamed the Earth - some dinosaurs were only as big as a dog, while others were the size of a bus," Mr Harvey said.

"The gardens works hard to ensure Australia's plants like the Wollemi pine, a tree that was around in the Jurassic period, don't go the way of the dinosaurs."

Visitor co-ordinator Megan Donaldson said dinosaurs such as stegosaurus and triceratops would be on display.

There are also a number of competitions being run for those who visit the gardens and take part in the fun.

Raptors' Run is one of the activities where kids can sprint for 20 metres to see if they're as fast as a velociraptor - a tenacious, predatory dinosaur which could run at speeds of 60 kilometers per hour. Fat chance kids.

The exhibition connects land and sea through a focus on sharks as well as dinosaurs.

National Dinosaur Museum general manager David Barker said the megalodon, an extinct 18-metre shark, used to devour land-living dinosaurs when they ventured into the water.

Visitors will be able to see tooth marks from where megalodon bit into their bones.

"We also have megalodon jaws, so you can get a selfie behind the 'meg,'" Mr Barker said.

The museum has the largest permanent display of dinosaur and prehistoric fossils in Australia, including a "larger than life" 20-meter long, eight-meter high dinosaur named Stan.

The skull of Sue, the oldest known T-Rex at age 28, will also be on display.

DinotraX is on during the school holidays from July 8 to July 21 and is fully wheelchair accessible and pram friendly.

"It's fun, adventurous and a great time to get out in winter," Ms Donaldson said.