Wait a few years for the plants to grow then you’ll take this back.
I have always maintained that rivertown as a theme will look better in 3-4 years time than on opening day. Every park known to man looks barren on day one then the plants grow and provide natural shade. Everything will look better with a bit of weathering.
I think it’s a bit of a silly expectation for an Australian park to install mature plants in a new build area considering how expensive it is to do so.