The solution is simple (seriously). Put one of those bakery ticket dispensers near every ride. Take a ticket. When your number is called, go and enjoy your ride. And if you’re in the bathroom, no problem. Your ticket trumps any later number called.
And as a side note, I really should open my own consulting firm. Charge big bucks for only saying what my grandmother would have said.
When I was 12, I said to my Grandmother
"I'm going to bottle tap water and sell it for more than the price of gasoline." She smacked me in the back of the head and said "Get back to your homework. You're never going to amount to anything!"