Up to 300,000 revellers are expected to pack Perth's Swan River foreshore for the nation's biggest Australia Day fireworks show.
While the 30-minute Skyworks pyrotechnics display starts at 8pm, spectators started gathering at Langley Park on the city side of the river and the South Perth foreshore mid-afternoon.
Police say they are taking a zero-tolerance approach to antisocial behaviour and will slap $200 fines on anyone caught drinking outside designated zones.
A State Government crackdown on illegal camping and unruly party-goers at the shack community of Wedge Island, north of Lancelin, has so far proved successful.
More than 4000 people gathered on the 400-metre-long island on Australia Day last year - authorities say the island can't cope with that many visitors - while a New Year's party this year ended in an alleged murder.
Department of Parks and Wildlife midwest regional manager Nigel Sercombe said visitor numbers were well down from 2013.
Perth beaches were busy, as expected, with a Guinness world record set at Cottesloe for the third consecutive year for the longest line of inflatable thongs on the ocean.