Hi Mate
Been a few times with the friends from my GTROC days. I hope to take the Audi there next year, work permitting.
Not going Daddy Mode on you, but here, in no particular order, my opinions and ramblings.
Make sure the Ring will not be closed on the dates you are choosing. There are times when companies will have booked.
Don't go on a Bank Holiday. Will be very crowded so queues to get on will be huge.
Public days you will not know the skill levels of the other drivers so be very sensible and drive well within your limits as the track is very long and not very forgiving.
You will see a lot of VW Golfs, Peugeot etc. If they have local plates, let them past. These guys know the track really, really well and you may get caught out if trying to keep up with them.
WEAR A CRASH HELMET!
DO NOT CRASH! You will be charged for damaging barriers etc and also for closing the cct. They will take your credit card details before they take your name.
75% of the turns are blind.
The sun can really blind you on some of the inclines.
The Karussel is my favourite turn in the world. Ever. Take it low and stay low when you exit or you will get thrown sideways.
If you can, arrange insurance which covers you for your time on track. I have [and haven't]. I always did after one of our group landed upside down in his M3.
Places to stay.
The Tiergarten is far and away the best hotel [in my opinion]. Book well in advance. Free wifi too so you can post here to say how much fun you're having.
Evening meal ... Steak on a Stone ... Fantastic. Beers are really good, but so is the wine and they do have Rum
The drive to the Ring is just as much fun, and sometimes more, than the Ring itself. Be very careful with your speed limits though.
When letting the car stretch its legs a bit, do so sensibly with your group, you can easily reach some quite nice speeds [I have been passenger in a GTR doing welll over 190] but even at 150+ you don't want to be too close to your friends cars.
If you have a PS3 or Xbox, drive the Ring on it. It really is quite accurate BUT it does not give you the feeling of camber etc when you are actually on the road.
Enjoy the trip. It is a fantastic experience.