Pass on the circle and go to Lime Rock and do the circuit. BMWs are meant for the twisties and not really for just trolling around in a circle. Top speed governer will kick in and we don't have that impressive of a top speed. Also, going at such high speeds for a prolonged period of time like on a circle will really tax the car's systems. Oil will go bad reeeeeeal quick.
But yeah, go to Lime Rock. I hear its amazing.