Hundreds of school leavers have started arriving on Rottnest Island ahead of a four-day celebration to mark the end of their school life.
Several groups arrived by private boat while others packed the ferries. More than 30 police are on the island and members of the dog squad were inspecting luggage as the teenagers arrived.
Claire Staniforth, Lauren Halliday and Madi Croker were among the first visitors to arrive, and said they were looking forward to "getting drunk" and relaxing.
Signs outside the island's general store warned adults that it was an offence to supply alcohol to under-18s.
A leavers-only entertainment area will be set up, available for teenagers who purchased a $100 wristband.
Leavers WA project manager Scott Birmingham said the zones would provide a safe, supervised and alcohol-free place for leavers to celebrate.
Island authorities are expecting 1243 leavers this year, up from 1136 in 2011.
A spokeswoman from the Rottnest Island Authority said the increase was due to the fact the ballot for accommodation was removed, and that the leavers period was during the week, meaning guests weren't charged weekend rates.