There are a number of clubs which host track days at Louden. The BMW club (Boston or White mountian Chapters) is the one I am familiar with and I know they have a great program. I think COM is another one. I don't know if you have to be a BMW club member (you don't have to own a BMW to join, I'm a member) in order to do the track days, but they do give a discount on your first time. Consider doing it as a whole weekend, ADSS (Advanced Driver Safety School) on Saturday then the track day on Sunday (or maybe ADSS friday and track days Sat and Sun), to get the most out of it. Just doing the ADSS is fun too. The BMW club will require the ADSS before going on the track (unless you can prove you have had enough track time and experience already). Don't know how other clubs do it.