The tour was a full day with not much on-your-own time for shopping. There was lots to see and the army duck was definitely worth it. As well as the Aboriginal dancers, boomerang throwing, watching how to play a digeridoo and throwing a spear.
We had never snorkeled before but as long as you watched the video and are comfortable in the water you will have no problems. There are lots of workers to help you in any way. I took a ginger sea sickness pill to help in case of rough waters. The reef was beautiful.