Many BMW Club chapters have drivers schools. You DO NOT need to own a BMW to belong to a BMW club!
My chapter hosts schools at Lime Rock Park and Watkins Glen.
http://home.nycap.rr.com/patroonbmw/DriversSchool.htm
Our School at Watkins Glen ( with NY Chapter) is a Monday & Tuesday--but is much less expensive than many other and will be held on the long course.
Go here
http://www.nybmwcca.org/driver_schools.shtml
What ever track day you go to--have fun!