You need to go down a dirt track for a while, lots of corrugation but nothing too bad. The walk is moderate and you need to ensure you know where you are going, because it isn’t signposted very well. I also believe there are other falls to visit along that track, I hope I have the chance to check them all out. It is a good walk to do in the wet, assuming the access report allows you to. I would say the walk is “moderate”. If swimming is your only goal, there are easier places to go like Maguk. Motorcar is a great place to go, but it wouldn’t be on top of my list, more like the place to go when you have seen a lot of Kakadu.