Children ages 5 and under can get Free Admission to SeaWorld and Busch Gardens with a Preschool Pass. Adult passes can be purchased at a discount online. Pay for 1 day and get the rest of the year for Free! Select your city, then look for the Fun Card promo. When I buy Sea World Fun Cards, I always upgrade my youngest child to a Silver Pass because the child pass is cheaper and the Silver Pass gives you Free parking!