There are some great parks around Dubbo.
Best Shade: Victoria Park
Victoria Park for shade, nice fenced kids playground, the Pool, and barbecues.
Water Play: Elston Park

water feature at Elston Park
Elston Park for a water play park for the children.
Scooter Track: Wahroonga Park
Wahroonga Park for a fantastic bike track.
Picnic near the River: Sir Roden Cutler Park
Skate Park: Victoria Park