The Blackwood Park Treetop playground opened in spring of 2018 and is a wonderful location for families to play on the various different pieces of equipment under the established eucalypts, nestled on a grassy hilltop with views down the Sturt Gorge Recreation Park to the west.
At the listed coords you will find a structure that you need to climb to obtain information to get the coordinates for the physical cache, which is a 1-2 minute walk away.
The physical cache can be found at
S35 2.a9a
E138 36.5bc
Where:
a = the number of flush allen-key bolts in a single floor panel of the western landing
b = the number embossed on a silver u-bolt connected to the red pole, that is about face-height, halfway between the western landing and the middle landing. "4.6 A1b"
c = the number embossed on a silver bolt that holds the slippery slide to the red frame. "A2 c0". Then add 1 to "c".
The physical cache is a bison tube within a camouflaged container that is well blended into its surroundings. The bison tube contains only a log, so please BYO pen.
Checksum: a + b + c = 17