most amusment parks will let you leave and come back in if purchase a days addmission you can always call the park in advance to see if this is permitted telll them that you want to spend the day at the park but need to meet some friends near by for lunch or dinner or some other exuse along those lines but want to know in advance if re entry is permitted with out having to purchase another ticket when you return that way when you are ready to burn one just go back out to your car and catch a buzz then come back and enjoy the rides if you are being dropped off then just exit and take a nature walk in the woods near by to burn one enjoy the day and happy birthday dude