I've been going over 20 years and this is my routine...
arrive at pit straight for start nomally by midday, drink, drink, drink...
at 4pm watch a couple of laps, drink, drink, drink....
then go to champagne bar for evening, drink, drink, drink...
similar thing sunday, watch another couple of laps at finish, drink, drink, drink
then in the evening go to Arnage for food and you guessed it drink drin, drink
hope this helps, don't bother with all that walking around lookig for cars!