Great Barrier Reef Snorkelling Day Trips from Cairns & Port Douglas

Outer reef, pontoon or island: what each day is actually like

Outer reef boats run 90 minutes or so towards the edge of the continental shelf, where the water is clearest and the coral densest, usually visiting two or three sites.

Pontoons are platforms moored permanently on the reef: a stable deck with snorkelling off the edge, plus dry options like a semi-sub or underwater observatory. They suit nervous swimmers and anyone who gets seasick on a rolling back deck.

Islands and cays, Green Island, Michaelmas Cay and the Low Isles, put sand under your feet: a shallow lagoon straight off the beach, easier but less dramatic than the outer edge.

Which Great Barrier Reef snorkelling trip to book

From Cairns, outer reef: the Full Day Outer Great Barrier Reef Tour from $269 sails a 25m catamaran to two outer sites with a guided snorkel and a chef-cooked buffet. The All-Inclusive Outer Reef Day Trip from $279 covers everything in one price, including a free scuba dive subject to medical clearance. Dreamtime Snorkel from $249 visits Moore Reef plus Milln or Flynn with Indigenous sea rangers sharing the stories of sea country. Silverswift Barrier Reef Cruise (Snorkelling) from $299 is the water-first option: unlimited snorkelling, up to three guided dives if certified.

From Cairns, pontoons and cays: the Moore Reef Pontoon Day Tour from $299 has snorkelling with instruction, a glass-bottom boat, a semi-sub and a waterslide on one platform. The Outer Reef Pontoon Snorkel Day from Cairns, from $319 is a 90-minute direct crossing and a full day on the pontoon. The Ocean Spirit Michaelmas Cay Day Trip from $279 sails a 32m catamaran to a sand cay for four hours on the reef. The Green Island Eco Adventure + Boat Snorkel Trip from $189 is the island day: a coral cay with rainforest in the middle, a one-hour boat snorkel trip and up to seven hours of island time.

From Port Douglas: Outer Reef Snorkel & Dive Cruise from $309 hits up to three sites across Agincourt and Opal Reefs; Silversonic Barrier Reef Cruise (Snorkel) from $309 does three Agincourt ribbon reef sites with about five hours at the reef; the Agincourt Reef Pontoon Snorkel Day from $329 is the Port Douglas pontoon, semi-sub and underwater observatory included.

Half days: Low Isles Morning Snorkel Trip from $239 is two and a half hours on a calm cay lagoon, back by 11:30am. The Cape Tribulation Reef Snorkel, Morning Tour from $199 is the Daintree option: two sites at Mackay Reef before lunch.

Cheapest day on the reef right now: Green Island at $189.

Stinger season, seasickness and what to bring

Stinger season runs roughly November to May and the boats supply suits, so wear them. Take seasickness tablets before boarding, and lean towards a pontoon or island day if you are prone. Pack reef-safe sunscreen, a hat, a towel, swimmers under your clothes and a dry bag. Visibility is generally best from June to October.