You will get camping passes on the other thread easily - just wait for everyone to wake up.
For my money i would just get 2 camping passes and save the messing about and worrying about going to check on your car if its parked away from your tent! The difference in price split between 4 of you shouldnt break the bank.
Thats my pennyworth for you!
And I agree with IRW - you are in for a great time - you can only lose your virginity once!