Park at the Horseshoe Bay car park and follow the Rotary Lookout Track.
You will need to turn off the track to the right just before the ramp to the lookout, heaps of people head this way so there is sort of a path there.
Cache is a blue biscuit tin and has heaps of small items for swaps. Cache was hidden by my 9 and 5 year old so they would love to see pictures when you find.