The Mohammed Bin Zayed Al Nahyan Playground is a small playground near the Canberra Mosque. It was donated by the Crown Price of Abu Dhabi in 2006, and while it's not attached to a larger park, is still a fun place to play.
The playground mainly consists of one large castle like structure. There are two slides, a climbing frame, a bridge, tunnels, and more. As well as this you'll find a set of swings and some smaller equipment. It's a simple neighbourhood park, so there aren't huge flying foxes or climbing frames, but it will easily entertain younger kids.
The playground and mosque are located in Yarralumla, close to all of the diplomatic missions. If you're considering going on the Diplomatic Estate Tour you might want to stop off at the playground once you're done, it'll be a bit of a treat for kids who might not be quite as interested in the architecture of the embassies and high commissions.