As part of this tour, you get to go on both the Turtle Discovery Tour and the Reefworld Aquarium. Which one you go on first will depend on your group.

Turtle Discovery Tour:

The Sunshine Coast’s Great Sandy Marine Park is a tropical paradise. Here, long stretches of white sand meets the crystal-clear waters that are home to turtles, dolphins and reef sharks

This is your chance to dive deep into the Park on a 3.5-hour eco tour. Hop aboard a specially-designed glass bottom boat, you’ll cruise through the calm waters and see all the reef has to offer – tropical fish and turtles included. Keep a close watch to spot the dolphins, dugongs and seabirds that call the park home. Or, get up close and personal with them as you snorkel over the coral.
Hear the legendary tales of the Butchulla people of K'Gari (Fraser Island) and surrounds. Discover the indigenous names and meanings of local landmarks.

Reefworld Aquarium:

Reefworld Aquarium is an all-natural aquarium, using only sand filtered sea water and natural sunlight. There are very few all-natural aquariums in the world, making Reefworld quite unique.

It is home to many different marine creatures including Green Sea Turtles, colourful tropical fish, and large reef fish.Hidden in the tanks customers will find tubeworms, crabs, shrimp, and starfish.

More info can be found here:
https://www.adrenaline.com.au/cruises/fraser-island/turtle-discovery-eco-tour
http://www.reefworldherveybay.com/