Platinum Pass Question

I already renewed my pass online this year, but I was wondering can I use my pass from last year or do I have to go to the season pass center?

You can use your pass from last year. Check your confirmation to see if you clicked on the "Register and Print Now" button. I renewed my son's pass but got a new one for me last fall. I didn't really pay attention to the confirmation. I figured I would need to print my voucher and have mine processed at the park but my son was all set. When I went to print my voucher last week, I noticed that my son's pass was listed in the "register and print" category as well. I clicked on that button for his pass and it took me to a screen which said his pass was now active. He got into the park later that day for his first visit of the year without doing anything other than going to the gate.