The beach had an advisory speed limit of 25km/h. Watson was ordered to pay $130 court costs in respect of each charge and disqualified from driving for nine months.
Outside court the once avid rugby and basketball player said he could not remember the "life changing" incident.
"I don't actually remember anything but as I look back now I think what a dick ... if I had of just gone home instead of going for a swim ... "
Watson was placed in a coma for eight days after the accident and spent five months in hospital. Now reliant on crutches, he is determined to walk on his own.
"I was told I'd never run again but I'll prove them wrong. I'll live with this forever; my hip is pretty stuffed, my bones from the knee down were shattered, I broke my femur, my ribs and they've put fake veins in - my legs are pretty stuffed but I did this to myself."
Watson says he misses being able to work as a shearer.
"I was supposed to be at the Golden Shears this year ... I'll go back eventually but it will never be the same."
- APN News & Media