Set yourself up under a shady tree and let the kids run wild at Speers Point Park. There is a massive slide there and scores of kids climb up the huge net to slide down the slide. It takes the kids a good 5 to 10 minutes to climb up and only seconds to slide down. Theres also a flying fox.
You can spend the whole day at this park, its all free and there is a water park, a toddler playground, bike track and BBQ's. There is also a cafe that sells meals as well as snacks.
Hint: Go with your kids when they visit the rest room. It's pretty far away from the park, and you won't be able to keep an eye on them if you are sitting at the park.
Hundreds of families visit this park every day, and I like it because it's free and all the kids find something to do here. We have been enjoying this slide for years and it's still one of my favorite things to do as a family.
If you want to get a bbq, get there early as people tend to stay all day.