Meet near the tennis courts on Huntriss road side (see photo and link: https://goo.gl/maps/vkch2Zt7vg3N6Ezw9).
The route around the lake is approximately 2.5km. It is a beautiful walk with bush areas and plenty of wildlife.
It's all considered off lead as long as you have control over your dog. We found that it's best to use lead sometime to avoid the tamptation to chase ducks into the water or bath in swamp water.