A gift voucher can be purchased as a present and redeemed for entry or purchases at the park. It is valid for 3 years from date of purchase and is valid for a dollar amount, making it flexible for the recipient.An online admission ticket is valid for 12 months from date of purchase to be used once.An online encounter ticket a specific pass with a set date and time for your visit. It must be purchased ahead of time and is valid only for the chosen date and time.