Have a leisurely breakfast and swim before taking a cruise on Yellow Water Billabong. You're guaranteed to see crocs, water buffalo, brolgas and magpie geese and given the amount of people who do this tour (up to 900 a day in the peak season), it's always a remarkably fresh experience.
Spend more time at Bowali Visitors' Centre or visit Nourlangie Rock (whichever you didn't get time for the previous day) and then head to Kakadu Culture Camp, run by Andy Ralph, his wife Jen and her brothers, for an introduction to spear throwing, weaving, and Bininj Creation Stories.
Pitch a tent at the culture camp, or stay the night in the camp's "luxury" tents, which sport solid floors, comfortable beds and heavy canvas walls. You might be pleased to have a buffer between you and nature when you wake halfway through the night to the sound of dingoes scratching at your door!