Michael James Beames, 35, was on a family trip to a friend's holiday house at Tomahawk in the state's northeast on December 29, 2019.

He did not hold a jet ski licence and was only given a lesson as a passenger by his friend on the day he died.

"The death of Mr Beames is yet another completely avoidable death of a person operating a (personal water craft)," coroner Olivia McTaggart wrote in findings published on Friday.

Mr Beames, who had a drink earlier in the day, was unable to swim and had fallen from the jet ski several times while being taught how to ride it.

He was wearing a life jacket at the time but later removed it and took his daughter for a ride.

The pair were thrown from the jet ski by a wave, with Mr Beames' daughter describing her father as panicked as she helped him back on the craft

"After dropping her off, Mr Beames indicated that he intended to continue riding, despite (his daughter) telling him that he should stop," Ms McTaggart wrote.

Mr Beames then attempted a solo "fishtail" manoeuvre that resulted in him falling into the water.

Two members of the public used a dinghy to bring Mr Beames back to shore, where attempts to resuscitate him lasted an hour before paramedics arrived.

Ms McTaggart said there was no evidence the jet ski hit anything in the water, describing his manoeuvre as foolhardy.

"In this case, it is difficult to comprehend the degree to which Mr Beames placed his own safety and that of his family at risk," she wrote.

"Once he returned to the water on the jet ski by himself and without a PFD (personal flotation device), his death appeared inevitable."

The man who gave Mr Beames instructions on how to ride a jet ski also didn't have a licence.

Ms McTaggart commended the actions of those who tried to save Mr Beames.

She noted "apart from the requirement to comply with the law, training gained in the licensing process may be the difference between life and death".

Australian Associated Press