Kakadu's tallest waterfall turns on in the tropical summer (book a scenic flight to see it in full force), but in the dry season, between June and November, Jim Jim Falls transforms into a deep swimming hole surrounded by boulders and 500-foot cliffs.
To get here, turn east off the Kakadu Highway 43 kilometers south of the Bowali Visitor Centre. Then travel 60 kilometers down a four-wheel-drive track, which easily takes two hours each way. Several tour companies include Jim Jim in their itineraries for travelers who don't want to drive on their own. Either way, the rewards far outweigh the trek, and the views are spectacular.