If you haven't dived for some time take a refresher dive with a Dive Master or local dive school before you visit the Reef. Practise in safe, shallow water before visiting the Reef. Be aware of strong currents around the islands. Stay away from areas where boats operate. The best idea is to look but don't touch.
Some marine organisms can deliver painful and dangerous stings.
Spearfishing Spearfishing while using scuba gear is prohibited. If spearfishing while using snorkel gear, please be very cautious of other people. Spearguns are not allowed on a national park unless stowed and completely disarmed. A number of things must be done before you head out on the water. Firstly, check the weather forecast and tide times.