The cache you are seeking is a short walk from here.
The Baldivis Brumbies play near the parking location, but wouldl need to go for a bit of a bush walk to find this cache.
If you stick to the path alongside Baldivis Road, then you should get to about 25metres from the cache before you need to "go in" and start your hunt.
There is a couple of nice walks around here and a few other caches nearby
Enjoy.