When your ready to jump to a track day, here are some clubs.

www.chinmotorsports.com <----- I recommend this club if you have never participated in a track day

www.safemotorsports.com <----- Advanced school. You have to show proof of prior track experience

http://www.drivenasafl.com/ < New school, but is run by the guy that started safemotorsports. I don't know that much about it, but my guess is it's an advanced school... just like safemotorsports