I reckon if we're traveling more than 2hrs from Sydney, may as well make it 3 and do it at Mungo - beaches, lakes, river, toilets, shops, and not crowded out of season.
I presume you mean Mungo Brush?? That would be fine by us - we spent a weekend at Banksia Green a couple of weeks ago (Mungo Brush was a bit crowded) and enjoyed it.
Lithgow? Its pretty close to Sydney, there's pit toilets and the glow worm tunnels are a great spot to take kids if anyones bringing any. There's 4bying around there so a good chance I will say hallo, and then dissapear for most of the day
I guess I am sitting on the fence Really any place within 2-3 hrs of Sydney would be great, and both places are where we would like to go again.