A 26-year-old man is in hospital suffering from head injuries after falling 60 feet down a cliff in the dark.
Falmouth Coastguard said its rescue team attended Towan Beach in Newquay, Cornwall, at 4.30am on Sunday morning after being called by ambulance staff.
A spokesman said the man, a tourist on holiday in the area, was taken to the Royal Cornwall Hospital in Truro for treatment.
A Devon and Cornwall Police spokesman said the man's injuries were "possibly life-changing" and said he appeared to have "lost his footing" before falling over the edge.
Newquay has been making efforts to clean up its image over the last two years after receiving negative publicity over antics carried out by revellers, many of them under-age. The town has been a popular destination for teenagers wanting a cheap getaway after finishing A-level and GCSE examinations.
In 2009 two teenagers died after falling down cliffs which line the town's seafront after nights out. The body of 18-year-old Andrew Curwell, from Saddleworth in Greater Manchester, was found at the foot of cliffs at Great Western Beach on June 28 that year.
The next month, Paddy Higgins, 16, from Wokingham in Berkshire, died after falling down cliffs above Tolcarne Beach.