It is still three months until the public will get its first chance to visit Barangaroo's headland park, but the area appears to have passed what might be its toughest test.

Former prime minister Paul Keating, who had strongly advocated transforming part of the former industrial precinct into a naturalistic headland, was "generally happy" with how the park was taking shape, the project's landscape architect and lead designer Peter Walker said.

"What I've heard from him is general satisfaction, which doesn't mean that tomorrow morning I wouldn't get an email saying: 'what the hell are you doing there?'" said Mr Walker, of PWP Landscape Architecture.

"In that respect he's been a really terrific client because he keeps asking the questions and then you have to stay on your toes and keep trying to answer them."