Ku-ring-gai Council says it has 67 tennis courts available for public hire. These local area tennis courts sit adjacent to a picnic area & children’s playground. Easily accessible from the train station and with ample parking, these courts are very popular and seem to be in constant use during opening hours (which are available on the council's website), at least when it's not raining.
Muggles are going to be your biggest issue here. Please avoid being seen when removing & replacing this cache. The cache location has been carefully chosen to minimise the chance of being muggled, so please make note of its exact location before moving it. Then please replace the cache in exactly the same spot. Thank you.
Congratulations to Themonarchmoth for FTF, at 46 minutes after publication!