They constructed the hut on Curtis Island National Park off the central Queensland coast, conducting a range of illegal activities including hunting with firearms before being caught by rangers.
The group of 18 people had cleared trees in the national park and used them to make the hut in a remote part of the island off Gladstone, Queensland's Environment Department said on Monday.
They then carried out illegal activities at the hut including the hunting trips, fires in a protected area and bringing pet dogs to the island.
Surveillance footage released by the department showed cars driving to the hut towing dinghies, motorbikes driving around the national park and all-terrain vehicles with trailers or strapped with surfboards.
In one image, a person can be seen standing in a trailer being towed by a buggy.
Footage also showed the hut had been equipped with furniture including tables, chairs and a barbecue, with a surfboard lying outside.
"People who want to build a hut for their own personal use for activities such as fishing, hunting and vehicle-based activities can do so on private land but not in a national park," the department's regional director Tina Alderson said.
Rangers were patrolling the Curtis Island National Park in August 2024 when they discovered the hut, later identifying the 18 people involved.
They were issued fines totalling almost $8000, with two people slugged more than $1000 each for their roles.
Some of the fines related to driving offences captured on surveillance footage, including driving in restricted access areas, using unregistered vehicles, and travelling with unrestrained people.
Rangers are now working to remove the hut, issuing a stern warning to anyone considering building in a national park.
"Queensland Parks and Wildlife Service is serious about compliance and anyone who builds an illegal structure in a protected area will be caught," Ms Alderson said.
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