Your best bet would be to do the electronic pickup option. You would buy them online and pick them up at the electronic ticket kiosks outside either park. You would need the credit card used and the confirmation number...it's very easy to do and quick. Plus...you wouldn't have to stand in the ticket lines.
Do the electronic pickup, just remember to bring the same credit card that you purchaced the tickets with, you will need it to put into the kiosk. Also if you wait till you get to the park to buy the prices are higher and I believe the $99 7 day ticket is no avalible at the gate if you need that pass.