Take a dip in the Figure 8 Pools - Situated in Sydney's Royal National Park, these naturally formed pools are the perfect place to take a quick dip. You'll definitely need the cooling effects of the water after the trek needed to reach the pools.
The best place to be on a wet day is near a waterfall. This is Minamurra falls, in Minamurra rainforest on NSW's south coast. A tiny enclave of temperate rainforest, a remnant of what once covered most of the south coast region.