Opponents of a premium tourism proposal for Lake Malbena in the Walls of Jerusalem National Park are planning an "Occupy Halls Island" protest for December.
Organisers expect about 100 people - including bush walkers, fly fishers and environmental group members - to make the approximately four-hour trek each way from the nearest road access.
Fly fisher Greg French announced the protest action at an information session on Wednesday night, which could include protesters setting up camp on Halls Island itself for at least one night.
Mr French said the protest would demonstrate the wide range of community opposition to the proposal and the approvals process.
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"This is direct action. This is an organic, grassroots protest," he said.
"The Western Lakes transcends political allegiances. Even in the fly fishing community there are lawyers, medical professionals, people who would normally be Liberal Party voters - they're opposed to this plan too.
"Then you have people who are competitive capitalists opposed to it as well. They hate the idea of land being given away without competition."
Last month, the Resource Management and Planning Appeal Tribunal approved the proposal after it was initially rejected by Central Highlands Council. Opponents were given 14 days to suggest conditions, which would take 14 days to be assessed before the tribunal makes its final decision.
Opponents are weighing up a Supreme Court challenge.
A Federal Court appeal regarding the EPBC Act approval is also continuing.
Mr French said groups and individuals would not give up in their fight against the proposal.
The Lake Malbena tourism proposal includes the operation of a helicopter for 60 days of the year for 30 bookings, for a maximum of 240 trips. The exposed bedrock landing area sits about 300 metres from Halls Island.
Opponents hope to limit the use of the helicopter via conditions on the permit as part of the RMPAT process.
Three accommodation huts and a fourth communal hut were proposed to be constructed on Halls Island, covering 64 square metres of floor space.
Proponent Daniel Hackett told The Examiner in January that prices for the "premium" tourism experience would be about $4500 per person for three nights.
He was contacted for comment regarding the planned protest.