Bunnings always has free things on too.
We are visiting the springs and doing lots of swimming at the free local water parks ( I'm in NT) we will go to the local parks and take soccer or cricket etc,
Also to the beach but just treasure hunt(crocs up here so no swimming) with the shells we collect we decorate cheap picture frames or cardboard boxes, get a head start on Christmas wrap aswell or cards for family interstate.
Cooking
Home made playdough with sticks, leaves, shells etc
Make a mobile with natural things
Draw with chalk on driveway
Teach the kids uno