The Palmersport days are, in my opinion, the best corporate jolly of them all. I've been lucky enough to go on three of them over the last few years. It was actually a day at JP when they had 350Z's that made me buy the car I drive today (although they have been replaced by the XKR's now).
The best cars of the day for me have always been the Caterham Seven's but to be honest, other than the 4x4's, everything is exhilerating.
Every race is timed and they usually give out prizes at the end of the day for the best laps in each vehicle. The instructors will help you in all of them except the single seater (and the Go-Karts, but they don't really need instruction). If you're lucky, you'll get to go around the West Circuit in the Palmer Jaguar JP1's (with an instructor) before you are sent out in the single seater however my top tip is that whenever you get sent out in the single seater, go hell for leather and don't worry too much about spinning off. They say they will caution you for coming off the track but when you're out with the instructors I guarantee you'll spin off several times so don't worry about it.
I'm very jealous.
Andrew