Would love a go but would be sh*t scared of stuffing it in to a barrier or something .
Just go there and drive normally and check your mirrors constantly. Nobody said you need to set the world alight. Just drive sensible and safe. Its an experience in itself doing that.
Dont worry about driving fast. But i would urge any motoring enthusiast to at least get over and drive the 'Ring even for 1 lap. Then, just spectate, talk cars and take in the atmosphere.