A 19-year-old will appear in court on Thursday
"The [punches] lasted for 15 to 20 minutes, I was knocked out in the water."
The incident took place near Rotorua on Wednesday.
Motorists were warned to expect delays.
Police are currently at the scene.
He has to pay out thousands after pleading guilty.
Emergency services were called to reports a person had fallen out of a raft.
The company was also ordered to pay reparations of more than $21,000.
"You are required to stay in your room until further notice."