Should you be travelling during the autumn, Winter season or spring I'd recommend enabling 2 nights in the Kakadu/Katherine location so you can benefit from the mountaineering trails. You can buy it in advance on-line or once you get there within the gate. I like to recommend purchasing on the https://road-trip-darwin-to-adela88613.actoblog.com/35974457/road-trip-darwin-to-adelaide-options