The picture has two children having fun with fishing net in their hands, which place is that? My children will love to go fishing for fun without license !

Lilyc Children under 18 don't need a licence to fish with a line or net in NSW.
You are required to pay the NSW recreational fishing fee to fish in fresh and salt water in the state unless you are:

under the age of 18
an adult assisting a person under the age of 18 to take a fish using a single rod or to take prawns using a single dip or scoop net
a person fishing in a private dam with a surface area of two hectares or less
an Aboriginal person
the holder of a:
current Pensioner Concession Card issued by Centrelink
current Pensioner Concession Card issued by the Department of Veterans' Affairs
Commonwealth Department of Veterans' Affairs Gold Treatment Card endorsed "Totally and Permanently Incapacitated"(TPI)
Commonwealth Department of Veterans' Affairs Gold Treatment Card endorsed "Extreme Disablement Adjustment" (EDA)
letter from the Commonwealth Department of Veterans' Affairs stating that the person receive a disability pension of 70 per cent or higher, or an intermediate pension.

Please note that Senior's Cards, Health Care Cards and Repatriation Health Cards will not exempt you from paying the fishing fee.
When fishing in NSW waters, both freshwater and saltwater, you must carry your recreational fishing licence or a receipt showing your payment of the recreational fishing fee, at all times. This includes when spear fishing, hand lining, hand gathering, trapping, bait collecting and prawn netting, or when in possession of fishing gear in, on or near these waters. https://www.dpi.nsw.gov.au/fishing/recreational/recreational-fishing-fee/exemptions

Hi lilyc - Thank you for your message.

Here is the event:
www.westernsydneyparklands.com.au/about-us/celebrating-50-years/sydneys-biggest-backyard-on-show-20-july-to-4-august/spot-that-waterbug/