The Accor Hotel in Kakadu NP is a good watering hole in Jabiru.
Just walk off the street, right thru to the back near the pool and you will find the Escarpment Restaurant. On the left side is the bar. Lunch is served from midday and dinner from 6pm.
We went here daily, while in Kakadu to have some drinks and eat and to get out of the heat. Very enjoyable.