It was hot. 36 Celsius and no breeze. The summer was coming to an end, and making one last attempt to zap anyone foolish enough to go outside with UV. But my five year-old son needed to let off steam and do something physical, so we headed up the mountain to Katoomba, and took his favourite train ride (the world's steepest!) down from Scenic World, to the rainforest below.It's beautiful down here. We hike and have a picnic together. It's green and lush and cool beneath the canopy.