Observatory is a shallow artificial reef and wreck site located off Middle Island, Australia. With depths ranging from 2 to 6 metres, it is well-suited for beginners and snorkellers. Access is by boat only, and the site is situated 15 kilometres from the shore. Currents are generally mild, though diving during slack tide is recommended to maintain visibility, which fluctuates between 5 and 30 metres. Species recorded around this area include hawksbill sea turtles, ornate wobbegongs, epaulette sharks, nudibranchs, and various reef fish such as rock cod, wrasses, and coral trout. Divers should remain aware of boat traffic and the presence of jellyfish, which are more common from November to April.

Olive Point headland is a shallow reef site located off Middle Island, Queensland. The reef features hard and soft corals and ranges in depth from 1 to 8 metres, with an average of 5 metres. Visibility varies significantly, ranging from 5 to 30 metres. Access is by boat only, and the site is suitable for beginners. Divers should be aware of moderate currents and potential hazards including boat traffic, sea urchins, and sharp coral. Marine stingers are more frequent between October and May, and a full-body lycra suit is recommended during these months.

Cullen Island, located at Middle Island, offers a versatile reef environment suitable for both shore and boat entries. The site features a wall and reef topography with depths ranging from 1 to 30 metres, averaging 4 metres. Conditions are generally mild, making it accessible for beginners. Visibility typically spans 10 to 30 metres. Divers and snorkellers should be aware of boat traffic and the presence of jellyfish, particularly between November and April. Stinger suits are recommended during these months. Facilities available at the site include equipment rental, a cafe, toilets, boat charters, guided tours, and parking.

Monkey Beach on Middle Island offers shallow reef diving and snorkelling in a protected bay. With depths ranging from 1 to 8 metres, the site is well-suited for beginners. The topography features staghorn coral formations that provide structure for the reef. Conditions are typically calm, though currents can strengthen. Visibility generally spans 7 to 16 metres. Divers and snorkellers can encounter wobbegong sharks, turtles, nudibranchs, sweetlips, and coral trout. Access is available via shore or boat, with facilities including parking, toilets, and a cafe nearby. Be aware of potential boat traffic and marine stingers, including Irukandji jellyfish, particularly between October and May.

Hideaway is a reef site located off Great Keppel Island, Australia, offering a quieter experience than other regional locations. The site features depths ranging from 6 to 25 metres, with an average of 18 metres, making it suitable for intermediate divers. Access is by boat, and divers should be mindful of sharp coral and rocks when entering the water. Visibility typically spans 10 to 30 metres, though currents can shift from mild to stronger flows. Species recorded around this area include ornate wobbegong, rock cod, wrasses, batfish, golden trevally, yellow boxfish, crabs, humbug dascyllus, lemon damsel, snails, and hard coral.

Butterfish Bay on Great Keppel Island offers a shallow reef environment suitable for beginners. Depths range from 2 to 5 metres, with visibility typically between 10 and 25 metres. The site features hard corals and plate coral formations. While currents are generally mild, they can strengthen, and it is recommended to dive at high slack tide. The bay is protected from south-easterly winds, providing calm conditions. Species recorded around this area include hawksbill sea turtles, ornate wobbegongs, epaulette sharks, and various wrasses and rock cod. Divers should be aware of boat traffic and the presence of jellyfish, with thin lycra suits recommended for protection.

Wreck Beach is a reef dive site located off Great Keppel Island, Australia. The site features a reef structure composed of hard corals, situated at depths between 10 and 15 metres. It is suitable for beginners due to the moderate depth and mild currents. Access to the site is by boat, and divers should remain vigilant regarding boat traffic during surface intervals and ascents. Visibility at this location is variable and can change daily, so it is recommended to check local conditions before departure. Divers should monitor their depth and time throughout the dive and use a surface marker buoy for safety.

Wreck Beach on Great Keppel Island offers a manageable reef environment for beginners, with depths ranging from 4 to 15 metres and an average of 8 metres. The site is protected from northerly winds, resulting in mild currents and visibility between 7 and 16 metres. A notable feature is the ancient brain coral, which serves as a central landmark. Species recorded around this area include Hawksbill sea turtles, Wobbegong sharks, Epaulette sharks, and various reef fish such as wrasses and rock cod. Shore and boat entries are both available, and local guided tours are offered to assist in locating specific marine life and reef structures.