It's a beautiful reef with colorful fish, and a guided drift snorkel lets you swim easily along with the current to see it. (ordinarytraveler.com)
If you feel like snorkeling, there is an amazing drift snorkel just a short distance from the shoreline. (bahamas-guide.net)
If you have a hire car, you may even drive to the nearest pick up location in Port Douglas from Cairns, as there is nothing else quite like this river drift snorkel tour anywhere else in Queensland. (cairnsattractions.com.au)