My dad worked in Air Traffic Control and finished his career working at Heathrow. I was lucky enough to go on several visits to the top of the tower and see the incredible work that happens there... the radar screens, the dishes out on the roof and the best view of planes taking off in the airport. I cannot imagine that this would be allowed today (it was 30 odd years ago when I visited) and it was a genuine treat!
My mum managed a dry cleaners which was ace as it meant I could buy whatever really - most of my friend weren't allowed dry-clean only clothes 
What sort of perks or treats did you get because of the jobs your parents had?