SYDNEY'S first public maze will be built, a shared cycleway constructed and crucial infrastructure upgraded as part of the first stage of a 25-year vision for Centennial Parklands.

The State Government will give $27 million to the Centennial Park and Moore Park Trust over the next four years to fund facility upgrades and for park maintenance.

The funding, included in next week's state Budget, will see $7 million go to short-term projects.

These include a shared cycleway along Oxford St, and significant upgrades to the Belvedere Amphitheatre and Moore Park Golf, as well as improvements to the sporting fields.

A further $19.5 million will be spent on park maintenance, such as replacing ageing trees.

The labyrinth, to be completed by the end of the year, will be funded through public donations. The trust's vision, to be released for public comment next week, also includes long-term, "concept only" projects.

These include student accommodation at ES Marks Athletics Field and an underground carpark at Moore Park West.

The trust's chief executive Kim Ellis said the park no longer relied on public funds for its day-to-day operations, with recurrent government funding to dry up next year.

"What people will see over the next couple of years is a significant improvement," Mr Ellis said.

"The park's in great shape already, but we just want to take it to the next level."