A friend and I spent 15 days on a Kakadu Highlights taking in Jim Jim and Twin Falls and then going to the south of the park.
The trip really did open up the wilderness for us - especially for my Swiss friend. The guides were very knowledgeable especially about Aboriginal art. We had our own botanist in the group which was great. The walking was challenging especially in the early days but the rewards at the end of each day were fantastic - great pools to swim in; spectacular sunsets and good food. I must say, the food was a highlight - not your normal hiking boring stuff.
To be highly recommended.