The under-18 Northland hockey team's star goalie has a strained neck and a torn bicep, meaning he's likely to miss a season as well as being off work for at least seven weeks.
Doctors at Whangarei Hospital told him he was "very lucky".
McDiarmid spent one night in hospital after having x-rays and a CT scan.
He is surprised the driver of the ute did not stop to help, although he dropped his passengers off.
"They said they didn't know him. One of them said he'd been at the wharf and helped the driver put his dinghy on the ute, then the guy offered him a lift to town.
The woman said she'd been hitchhiking and the driver had stopped for her at the top of the [Onerahi] hill."
McDiarmid said he was angry about the accident that has left him with at least one injury which could yet require surgery, his bicep muscle. It also smashed his uninsured scooter.
Sergeant Rachel Wood confirmed the police had the dinghy and would like "to have a chat" to the driver of the older style, dark coloured ute.