Michaelmas Cay is a small coral sand cay 41.3 kilometres north-east of Cairns. It sits on the outer Great Barrier Reef, surrounded by a fringing reef and supporting one of the region’s most important seabird breeding areas.
For most visitors, the easiest way to reach Michaelmas Cay is on a full-day cruise from Cairns. Allow about two hours on the water each way and roughly four hours at Michaelmas Reef. The day combines beach-entry snorkelling, a semi-submersible or glass-bottom reef tour, seabirds, lunch and time aboard a large sailing catamaran.
The appeal is that you can step onto a sand cay as well as see the reef. First-time snorkellers get a shallow beach entry and included equipment. Anyone staying dry can still view coral and marine life from the semi-submersible or glass-bottom boat.
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Michaelmas Cay is a low, vegetated sand cay within Michaelmas and Upolu Cays National Park and the Great Barrier Reef Marine Park. Coral fragments, shells and other reef material built up over time, while vegetation helped stabilise the sand. The result is a small patch of land surrounded by Michaelmas Reef rather than a large island with a resort, roads or walking trails.
The combination of reef and birdlife is what sets the visit apart. Seabirds nest on the cay throughout the year, including noddies and several species of tern. Queensland Parks has recorded up to 20,000 breeding pairs, but the size and mix of the colony change through the year.
You do not walk around the whole cay. Visitors stay inside a roped beach area, and the rest is protected for nesting birds. Most of your time ashore is spent beside the water in this permitted zone.
Michaelmas Cay is reached by boat. Commercial cruises and private vessels can both visit, but there is no public ferry that drops you off to explore independently.
If you do not have your own boat, the simplest option is the Sailing Catamaran Great Barrier Reef Full Day Tour from Cairns. It leaves from the Cairns Reef Fleet Terminal and includes the crossing, meals, reef equipment, beach transfer and activities in one full day.
If you arrive by private boat, approach through the marked northern channel and follow the public-mooring limits for vessel size, wind conditions and length of stay. Michaelmas Reef is a protected Green Zone, so fishing and collecting are not allowed. On land, access is restricted to the roped beach area between 9.30 am and 3 pm. Do not cross the ropes to walk, take photos or have a picnic.
The current full-day trip uses a 32-metre sailing catamaran and takes about two hours to reach Michaelmas Reef. The crew raises the sails when wind and sea conditions allow, and uses the engines when needed to keep to schedule. Expect a mix of sailing and motor power rather than sailing under canvas for the entire crossing.
The outward journey includes the safety briefing, snorkelling demonstration and a marine-biologist presentation. This gives first-time snorkellers time to get familiar with the equipment before entering the water.
The vessel spends about four hours at the reef. A short glass-bottom beach shuttle runs between the catamaran and the visitor area, so you can move between the cay and the boat during the stop.
During the stop, you can snorkel, join the included dry reef-viewing trip, watch the seabirds and see the fish-feeding presentation. There is still time to sit on the beach or return to the catamaran’s deck between activities.
Morning tea, a hot and cold buffet lunch and afternoon tea are served onboard. Toilets are also on the catamaran rather than on Michaelmas Cay.
The return crossing finishes the full-day schedule with cheese, biscuits and a glass of sparkling wine. After an 8.5-hour day, leave your evening free instead of booking another timed activity as soon as you reach Cairns.
Snorkelling starts from the beach rather than by stepping off the main vessel into deep water. The coral begins a short distance from shore, so you can adjust your mask and get comfortable in the shallows before moving farther out.
A mask, snorkel, fins, lycra suit and buoyancy vest are included. Crew members give a demonstration on the way to the cay and supervise the snorkelling area. Look for coral, giant clams, tropical fish and green turtles; exactly what you see and how clear the water is depend on the day’s conditions.
You do not need to snorkel to enjoy the reef. On the included reef-viewing tour, you look through underwater windows in the semi-submersible or through a glass panel in the boat while the guide explains the coral and marine life.
The short beach shuttle also has a glass bottom. A non-swimmer can join the included reef-viewing tour, marine-biologist presentation and fish feeding, then spend time on the cay and catamaran. For more detail, read our guide to seeing the Great Barrier Reef without swimming.
The birds are not a side attraction here. Michaelmas Cay supports thousands of nesting seabirds, and the colony is visible from the permitted beach area.
Stay inside the ropes and give resting or nesting birds space. Drones, umbrellas and kites are prohibited because they can disturb the colony. Food stays onboard, which also keeps scraps away from the birds.
The standard cruise already includes independent snorkelling and a reef-viewing tour. For more help identifying coral and marine life, you can add a 45-minute small-group snorkel with a marine biologist.
An introductory scuba dive is another optional extra. No certification is required, but participants must be at least 12 years old, complete the onboard medical screening and attend the dive briefing. The shallow practice area gives first-time divers a place to learn the basic skills before the supervised dive.
Yes. Beginners enter from a sandy beach into shallow water beside the visitor area, with flotation gear included. You can take your time in the shallows, listen to the demonstration and enter under crew supervision instead of starting from the side of the main boat.
It is still the ocean rather than a pool. Wind, current, tide and visibility affect the water, so stay in the supervised area, snorkel with a buddy and follow the crew’s instructions. The included lycra suit offers some protection from sun and stingers, and a buoyancy vest helps you float with less effort.
Children can paddle and get comfortable in the shallow sandy area with an adult beside them, while the included reef-viewing tour gives everyone a break from swimming. Lunch and toilets are onboard, and the beach shuttle makes it easy to return to the catamaran.
The crossing takes about two hours each way, so young children and anyone prone to motion sickness spend a large part of the day onboard. The catamaran has indoor and outdoor seating. If you normally use motion-sickness medication, take it as directed so it has time to work before departure.
Green Island and Fitzroy Island give you more time to explore on land. You can follow walking routes, use established visitor facilities and plan more of the day independently. Michaelmas Cay has no shops or walking circuit, and your time ashore is spent in the small visitor area beside the reef and birds.
Read our guide to the best islands near Cairns when independent beach time or land activities are a major part of your plan.
A reef pontoon is a large offshore platform with a structured base for snorkelling, dry reef viewing and optional activities. At Michaelmas Cay, you step onto a natural sand beach beside a protected bird colony.
Both formats give non-swimmers a way to see beneath the surface. On a pontoon day, you spend the stop on a fixed platform over the reef. At Michaelmas Cay, you move between a sailing catamaran and a small coral cay.
Multi-site boats visit more than one reef location and move during the day. The Michaelmas Cay cruise stays at one reef for about four hours, which gives you time to snorkel, take the reef-viewing tour and sit on the beach without packing up for the next site.
Book Michaelmas Cay for a first reef day when you want beach-entry snorkelling and seabirds, with enough time to settle into one reef location.
Bring:
Wear comfortable shoes for the boat and beach transfer. You do not need hiking gear because visitors remain in the small roped area. The tour supplies snorkelling equipment, a lycra suit and a buoyancy vest.
Keep your food on the catamaran. Meals and drinking water are available onboard, while the cay itself has no shops, toilets or visitor centre. If mobility access matters, note that the cay has no wheelchair-accessible tracks or facilities. Access on the catamaran and beach shuttle is a separate consideration.
Michaelmas Cay is worth the full day when you want a reef trip that also includes time on a natural sand cay. You step onto the cay, enter the reef from the beach, watch a major seabird colony and still have a way to see below the surface without swimming.
Four hours at the reef leaves time for snorkelling, the included reef-viewing tour, the beach and the catamaran. The crossing takes about two hours each way, so this trip suits travellers who enjoy being on the water as much as the destination.
