Best to Stay at the circuit campsite, try to get in the section on the outside of the ' Stadium ' section just before the North curve rather than the other areas which are the other side of the motorway. Don't think you can book but look on the circuit website. Great atmosphere.
Try the ' Gausthaus ' in the town ( by the large church ) for home brewed beer, good grub and a racing theme.
Have a look at the ' Jimmy Clark ' memorial which is now on the outside of the circuit by the North curve and walk the forest and follow the route of the old track, easy to follow and you will see the JC crash site with a small wooden cross to indicate the site.