About 500,000 people are expected to travel into Brisbane’s CBD for annual Riverfire extravaganza.

Fighter jets, Black Hawk helicopters and fireworks will light up Brisbane’s skies during the annual Riverfire extravaganza.

Police say this year’s event, which caps off the Brisbane Festival and typically draws larger crowds than New Year’s Eve, will attract about 500,000 spectators on Saturday night.

And it will also include a special ANZAC surprise.

More than 80 horses will ride through the River City to mark 100th anniversary of the Queensland’s 2nd Light Horse Regiment and the 9th Infantry Battalion departing for World War I.

Australian Light Horse Association president Lawrence Watts says riders from all over the country have been training for months.

He says it’s the largest number of horses to ride through the city for at least a generation.

“It will be a magnificent ride, to remember both the men who fought and their horses,” Mr Watts told AAP.

Two F/A-18F Super Hornets are also scheduled to scream over the CBD at about 1000km/h at 5.40pm and 7.04pm.

During the later flyby the fighter jets will put on full afterburners to begin a fireworks extravaganza from 7.04pm.

The pyrotechnics will be launched from South Bank, CBD rooftops and the Story Bridge.

Organisers say the best vantage points will be South Bank, Kangaroo Point and the Riverwalk.

There will be more police patrolling than usual, due to the heightened terror threat, although Senior Sergeant Shane Hancock says there’s no specific threat.

But he wouldn’t be drawn on whether he was most looking forward to the fireworks or the fighter jets.

“I’m looking forward to everyone going home with a smile on their face and enjoying the evening proper, that’s public and police alike,” Snr Sgt Hancock said.