If you already know the Nerang - Murwillumbah Rd road, the following can be considered to be egg sucking lessons, and for that I humbly apologize.
Most of us will be going to Natural Arch via this road (otherwise known as the Russ Hinze Raceway), the "local knowledge" is that the police are actively enforcing the speed limits right through to the border.
In recent months I have been spotted with a laser thingy, breath-tested once and radar-ed twice. It was reported in the local rag that the police have said they would use some sort of device mounted in an aircraft. I think I saw one of those out on the Beaudesert - Rathdowney road ages ago, but I've never been aware of it at other times. (Doesn't really concern me, I very rarely exceed the speed limit).
Anyway, if you do stick to the limit (80 kph), and I mean stay near the limit through (almost) every corner until you get to Numinbah Village (strictly 60 kph), you will have fun. I think it would be safe to say it is a well surveyed and reasonably well maintained bit of tarmac. Unless its wet .... and then I am always guided by the advisory speeds.
There is a reasonable chance there will be plenty of motorcycle traffic on the road and I have often seen riders think they are Agostini and hang out over the double lines, coz they think its faster and they cant wait to get home because their bike is so bloody uncomfortable and my god its hot in my ever so special leather racing suit and the bloody electrics are dying on the Duke, or the middle piston on the Trident is over-heating and why won't that bloody tin-top get out of my FU**Ing WAY - YOU FU**ING IDIOT! Bang!
Mind you, you will also come across many gentlemen riders on this road.
Of course, your results may vary.