I?ve visited the track once but there was a private Trackday on for Amg .
Managed to get in and have a look around, serious set up and in a nice scenic part of Belgium about 1-1.5hrs from Nurburg.
The only way you can drive on the track at spa is book a Trackday , so you would need to make sure there is Tourist Driving dates available at the Nurburgring and maybe work around that to match up with Trackday dates at Spa.