If you are in a wheelchair, book your trip to the reef on a flat decked catamaran! The ride out is quite smooth and easy for the disabled and if you can't snorkel, the staff may be able to help you into a semi-submersible to view all the wonderful life on the reef. They helped me do it!
Also, the train to the Kuranda rainforest is completely wheelchair friendly, as is the cable car, if you want to try that on the way back!
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