Queen mary falls owns all, Roads, Scenery, the lot. continue on to kilarney and back across the wheatbelt toward warwick then take revheads murphy creek option, Just watch it, its not as secret as it used to be and plenty of heavy transport is starting to use it.
Or, drop back down off queen mary and head out through boonah. Turn right at Rathdowney and drive for about 15 mins. do the bellbird range. About 40 kays of heaven with very limited traffic. Turn around and do it all again in reverse, You'll be dizzy by the time you finish.