Drinking water is not available in most of the parks and visitors are encouraged to take enough for their own use.
Some of the areas are Disease Risk Areas, which has to do with the preventing the spread of the plant disease Phytophthora Dieback (Phytophthora cinnamomi). More information on Dieback can be found here. Cars and bicycles are not allowed in Disease Risk Areas and walkers need to ensure that their shoes are cleaned before and after visiting these areas.
There is also an increased chance of forest fires in the region in the hot summer months. For information on what to do if you encounter a bushfire visit 'Bushfires and Prescribed Burns'.