If you havn't got it in your library already, get yourself a copy of..
'TAKE A WALK in South East Queensland' by John & Lyn Daly.
Covers a lot of maintained & off the beaten track walks.
Page 261 & 258 are ones you need for the info to this area.
Take roughly 5hrs to get there, can be done in a long day trip
but way better off as an overnighter to take in the fading sunset &
the misty morning sunrise.
Dehydration is an issue so take plenty of water.
Its not a walk in the park, research the area. Main Range National Park,
Also a bit more info in this forum too....
You'll also need map Townsend 25,000 series
The route....Sylvesters lookout- Laidley falls- Hole in the wall- Boars Head- Mt Castle
Google Earth gives you a rough idea of the terrain.....
Hope that helps.....if you need any more info, give me a PM.