I just did my first track day at Summit Point in my 2004 after autocrossing it for a year. Same position as you.
Assuming your car is well serviced, all you should need is an extra half quart of oil to ensure adequate pick up in high-g corners. Some use a full quart. The car is pretty bullet proof and will hold up well on the track.
Some advocate a change in brake fluid--and track friendly pads. You can do your first track event without all of this with no harm, though. Your tranny fluid and rear end ought to be OK.
Have fun. Lime Rock?
