Wangi Falls in Litchfield National Park is a spectacular place to visit for great photography opportunities. During the Top End's dry season it is also a great place to swim and enjoy cool, clear water.
Waterfalls provide an interesting range of shooting opportunities, with my preference being for silky smooth water as seen in this image.
This image was created in the middle of a bright, cloudless day, so to achieve the silken look I used a Lee Big Stopper 10-stop ND filter. This resulted in a 25-second shutter speed at f/8.0. This slow shutter speed also resulted in a smooth surface on the lagoon, and enhanced the reflection of the waterfall.