East of the coast of Cairns, the snorkeling at Fitzroy Island is known for its fringing coral reef formations surrounding the granite island. The water depth ranges from 1 to 10m and are teeming with marine life.
In addition to the diverse marine life, the Irukandi Jellyfish may also be present from November to April. This tiny box jellyfish is about one cubic-centimeter in size and is the most venomous jellyfish in the world. Snorkelers who have encountered the Irukandi Jellyfish have reported only a slight stinging sensation, and then 30 minutes later they have muscle cramps and nausea followed by increase blood pressure and heart rate. A sting usually requires hospitalization. While many local snorkelers believe that no jellyfish are present here, a full-body stinger suit with hood is recommended from November to April when snorkeling here. A Fitzroy Island snorkeler was stung as recently as 2016 and had to be hospitalized for 3 days.
To reach the snorkeling at Fitzroy Island, there is a daily ferry from Cairns. The 30km trip takes about 45 minutes.
Overall, Fitzroy Island is the 32nd most popular snorkel dive spot of all 37 snorkeling dives in Queensland.