Chessington World of Adventures has been fined £150,000 following an accident in 2012.
A four-year-old girl fell around 4 metres from the elevated queue line for the Tomb Blaster ride, when rotten fencing gave way.
The Surrey theme park admitted guilt late last week, and said that it “deeply regretted” the incident.
Guildford Crown Court heard in the earlier hearing that water from a roof had been dropping onto the queue line’s wooden fence panel, promoting rotting and weakening.
The park was ordered to pay £21,614 costs in addition to the fine.
The girl spent 10 days in intensive care after suffering a fractured skull, bleeding to the brain and fractured ribs.
Journalists in court report that Chessington is in discussions over compensation for the family, which are separate from the criminal proceedings.
Health and Safety Executive (HSE) inspector Karan Morris said: “This was a disastrous and horrifying incident for the child and her parents.
“Chessington had insufficient measures in place to prevent or control the risk of falling from the raised walkway.”
A park statement said that the health and safety of its guests and employees was its top priority.
“What happened to the young child was an isolated incident which we deeply regret, and from the outset we have put in place a package of support for the child and the family which will continue for as long as is required.”