Yallingup Lagoon is the easy alternative to the Aquarium for snorkellers on the Capes coast. The Life of Py describes it as sheltered, beginner-friendly and within walking distance of Yallingup town, with protection from the open ocean and pounding waves, depths of just 1-3 m, and a 30-45 minute snorkel over roughly 500 m. Stingrays, various fish, starfish and seagrass gardens are the main sights, and the reviewer saw smooth rays and groups of fish. The Margaret River region's ocean-safety guide also names the Prevelly and Yallingup lagoons as suitable for beginners.

The lagoon lies inside a limestone reef that breaks the swell, so while surfers ride the waves outside, snorkellers float in calm water behind. The bottom mixes sand, seagrass and low reef, and smooth stingrays often forage close to shore.

It suits families and beginner snorkellers, and it is a good place for visitors to get used to the Capes coast before trying more exposed sites. Scuba adds little given the depth. The traditional custodians are the Wardandi people.

Facilities in Yallingup are close by, making this a convenient early-morning snorkel before the sea breeze arrives.

The Capes coast between Cape Naturaliste and Cape Leeuwin faces the Indian Ocean and is famous for its surf, which is exactly what makes diving here so condition-dependent. Long-period south-westerly groundswell can arrive on calm, sunny days, and the regional ocean-safety guide advises observing a site in different conditions before diving it, never diving alone and flying a flag near boat ramps.

Yallingup is about 3 hours south of Perth and 10 minutes west of Dunsborough. From Yallingup Beach Road, use the stairs from the main beach car park or the gravel car park near the caravan park; the lagoon is within walking distance of the town centre. Enter from the sand into the lagoon behind the reef.

The nearest full-service dive shop for fills and hire is Swan Dive in Busselton; there is no dedicated dive shop in Margaret River or Augusta, so bring filled cylinders.

The outer reef protects the lagoon from the open ocean and pounding waves, making it suitable for beginners; it is best in summer. Big swell can push water over the reef and create currents in the lagoon, and Yallingup is also a well-known surf break outside the reef. General pattern on the Capes and Leeuwin coast: summer mornings often have light easterly (offshore) winds before a south-westerly sea breeze, and long-period south-westerly groundswell can arrive on otherwise calm days; winter fronts bring big swell and north-westerly winds.

Check the Bureau of Meteorology swell forecast, not just the wind.

Enter from the beach and snorkel about 500 m around the lagoon over seagrass and reef, keeping inside the outer reef. Snorkellers should stay within easy reach of the exit point and swim with a buddy; scuba divers at these depths need no safety stop but should ascend slowly and surface near the float.

No operator needed - self-guided snorkel. Oceania Experiences runs small-group snorkel tours on the Capes coast; Swan Dive (Busselton) supplies hire gear and fills.