The park is open every day of the year (except Christmas and and Good Friday, from 7am to 6pm (9pm during daylight savings) & entry to the park is free.
For details about the park (and the other caches here) please visit:
Wilson's Walk: Final.
or ..
Wilson's Walk: Exploration.
The Cache
The Hoo-Hoo Lookout Tower is an impressive wooden structure set high on the hill. A steep path leads past the playground directly up the hill or there are several longer but less steep paths that approach the Tower from either side. The Tower provides extensive panoramic views of the South Eastern Suburbs of Melbourne from the top but hold tight to the rails if you don't like heights.
The cache is somewhere on/around/in/under/over the wooden structure at GZ. You do not need to cross into any fenced-off area or trample the garden beds to find the cache.
BYO pen and please replace the cache so it can't be found accidentally.
Be aware of muggles as this is a popular location, especially on holidays and weekends which may make the cache more difficult to find with the required stealth.