Hallett Cove Conservation Park

Hallett Cove Conservation Park, on Adelaide's southern coast, is one of the most geologically significant sites in the country — a dramatic stretch of coastline where ancient rock formations, sculpted cliffs and the striking Sugarloaf reveal hundreds of millions of years of Earth's history, including evidence of an ancient glacial period.

The appeal is that combination of fascinating geology and stunning coastal scenery, best explored via the excellent clifftop boardwalk and walking trails that wind along the shore with sweeping views over the gulf. It's a genuinely unique outing — part nature walk, part journey through deep time — and a rewarding escape on Adelaide's doorstep.

With a 4.8 rating from more than 700 reviews, it's a much-loved spot. The park is free and open, but trail conditions, the boardwalk and parking vary, and the coastal paths are exposed to the weather, so it's worth checking current details before you go — and taking water, sun protection and sturdy footwear, and allowing time to read the interpretive signs that bring the remarkable geological story to life.