The "remotest" place I've ever ventured to was Moree but finding it was quite easy with those massive silos/sheds that stand out like dogs balls, so something a bit more challenging would be awesome.
Always found navigating around the bush quite easy, with so few man made features, when you do finally see something, it is usually what you are looking for!
Can't believe we've got this far and no one has mentioned William Creek! Not a destination, but well worth seeing, 'Gosses Bluff' West of Alice and North of Uluru looks great from the air. Besides the regular places, Mt Dare and Old Andado stations are well off the track, Borroloola if you like fishing, even venture up into Kakadu.