To be fair there are less chances of stone chips on a trackday than using it on the road.
As for people hitting you, that is also less likely than on the road. For a start there's no on coming traffic on a track.
The most likely cause of damage will be running out of talent and binning it into the armco, gravel trap or soem cones depending on where the trackday is. In all the years I've been doing them I've never hit anything and only left the track a couple of time that resulted in bouncing across some grass and having to clean clods of turf off my exhaust.
The idea of trackdays is not to set the fastest time you can (after all timing is banned, that's what expensive test days are for). The idea is to be able to rag your car in a safe and controlled environment where you can explore the limit sof yourself and your car. In A FWD Golf the most th emost likely outcomes of running out of talent will be:
* Out braking yourself and running wide off a corner
* Lift off oversteer and spinning out
* Understeering off the circuit
As long as you go on a day with plenty of experienced people no one minds you pottering along at your own pace as long as you are polite and pull over to let quicker drivers past. I think where you'd have to be mind full is annoying people in the corners. There's nothing worse than a quick car hooning off infornt of you on the straights only to slow you down when you catch them back up through a series of bends and you have to back off. If you see people always catching you in the corners you just lift off on the next straight and let them pass.
Nick