Yes Yes Yes But no straw
Yes back packs are allowed and you can bring your own food. However in Seaworld no straws are allowed because often people will todd them to the side and the animals will consume them. There are rides/areas for children and adults. I am not sure about the discounts. I do know that for hanicapp individual you get preferred parking and can get a pass for quick entry on the rides. The discounts that I know are available are for annual pass holders you can bring a friend or family for half off the regular ticket price.
Thanks! Your answer is awaiting moderation.