Security plans for the G20 leaders' summit will be tweaked after a successful test run during the finance meeting in Cairns, police say.
A two-day meeting of finance ministers and central bankers from the world's richest nations in Queensland's far north finished on Sunday afternoon.
It precedes the G20 leaders' forum in Brisbane in November.
Queensland Police Commissioner Ian Stewart says the Cairns meeting was a success and lessons learnt will help shape security plans for the Brisbane summit.
"Obviously we review all of our systems and procedures after any major event like this to see if we can improve the way we have done things," he told media in Cairns on Sunday.
"There are some small changes we'll make between now and November."
Mr Stewart wouldn't go into detail, but Assistant Commissioner Katarina Carroll, who heads up the Queensland Police G20 Group, said there would be minor tweaking around management systems and allocating tasks.
"When we started planning G20 some two years ago we came up with new processes, new IT systems - you name it," she said.
"We've really just used this for the first time in Cairns so it's actually more tweaking the planning rather than any major changes."
Ms Carroll said officers were relieved there were no major incidents and attention had now turned to planning the leaders' summit.
She said Russian President Vladimir Putin's attendance wouldn't impact security arrangements as it had always been assumed all leaders would attend.
Cairns Chamber of Commerce CEO Debbie Hancock said delegates she'd spoken to had raved about how beautiful Cairns was.
"They said they were keen to come back, bring their families back and the feedback we've had from our members is that they've been doing a roaring trade," she told AAP.
"Even the coppers have been having a ball here and sending back postcards."
An extra 800 officers from across Queensland have been patrolling Cairns this week and parts of the city have been in lockdown.
There were significantly more arrests in the tourist town over the weekend due to the extra police presence but no one was charged in relation to the G20 event.
Two people, aged 18 and 19, were banned from the CBD after they were caught with laser pointers - one of many items banned in a restricted area.
Up to 150 people staged a peaceful protest on Sunday morning outside the convention centre where the finance meeting was held.
The colourful demonstrators, many holding green, heart-shaped signs, called for climate change to be put on the G20 agenda and for Australia to become solely dependent on green energy by 2050.
Treasurer Joe Hockey, who co-chaired the finance meeting, was met by a group of about 70 protesters when he attended a conference at a local university on Thursday.
Mr Stewart said he didn't believe bringing hundreds of extra police into Cairns was overkill.
Additional police powers and a restricted zone in the city will cease at midnight on Sunday.
Police have received some criticism after vowing to clear homeless people from Cairns streets during the G20 meeting.
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