East Reef, off the eastern side of Hayman Island, is a site that 100 Magic Miles rates highly for its coral but warns is hard to get to. The guide describes very good coral cover in shallow water, 6–8 m, cut with numerous small canyons, and large plate corals creating ledges; small friendly reef fish are abundant, and the snorkelling is 'excellent' over the shallow coral. Visibility is often better than at the sheltered western bays, at 5–15 m.

Its exposure explains both the quality and the difficulty. The reef is open to winds from almost every direction and to tidal currents, so it is diveable only on very calm days at slack tide – conditions that occur most often in the calm build-up months of October to December. When it is accessible, the relative lack of visitors and the vigorous water movement give it a fresh, unvisited look.

Because anchoring is difficult and conditions change quickly, a live boat drop and pick-up is the sensible approach. The site suits snorkellers and divers happy to stay shallow; the interest is in the canyons and coral structure rather than depth. No operator schedules East Reef, and its exact position is not published in the sources reviewed.

Cyclone Debbie's effect on the site is not specifically documented, though Hayman's western bays were hit hard. Treat this as a calm-day bonus site to check with local skippers. When the forecast shows a rare windless morning with neap tides, it is worth asking a charter skipper whether East Reef is an option before defaulting to the busier western bays.

Boat only. Hayman Island's north-west coast is about 20–24 nautical miles from Airlie Beach – roughly 45–70 minutes by fast day boat from Coral Sea Marina or Port of Airlie, or about 1 hour from Hamilton Island marina. Day tours that stop here include Ocean Rafting, Red Cat Adventures (Thundercat), Whitsunday Dive Adventures and Explore Group (from Airlie and Hamilton Island); overnight sailing and bareboat charters also visit.

Private and bareboat skippers must use the public moorings (time-limited, first come first served) and observe no-anchoring areas marked by reef protection markers; bareboat operators restrict where hirers may go. Parking at Airlie is available near Coral Sea Marina and the Port of Airlie. Access to East Reef is difficult and requires very calm days at slack tide.

The northern Hook Island bays face north and are sheltered from the dominant south-east trades (15–25 knots April–September), but they are open to northerly winds and swell (common October–March) and to very strong south-easterlies that wrap around the headlands. Tidal currents through the islands are strong on spring tides (tidal range up to about 4 m) and can make points and bay entrances difficult – plan dives at slack water and neap tides where possible. Visibility is usually 5–15 m, dropping after strong winds, big tides and wet-season rain.

Manta rays visit May–September. Marine stinger season (box jellyfish and Irukandji) runs roughly November to May – wear a full-length stinger suit or wetsuit with hood and gloves, carry vinegar. Cyclone season November–April; tropical lows and cyclones can close sites and damage coral (TC Yasi 2011, TC Debbie 2017).

Severe Tropical Cyclone Debbie (March 2017) badly damaged the fringing reefs of northern Hook and Hayman islands; recovery is ongoing. 100 Magic Miles notes difficult access owing to exposure to wind from most directions and currents; only very calm days at slack tide.

On a glassy slack tide, drop in over the shallow reef and explore the small canyons between plate-coral ledges at 4–8 m, staying close to the reef and being picked up by a live boat.

Occasional private charters and sailing trips on very calm days; no scheduled operator. Nearest dive centres for gear hire, fills and local advice: Whitsunday Dive Adventures, Explore Group, Ocean Rafting, Red Cat Adventures, Cruise Whitsundays.