WE never do rides at Seaworld and can spend 2-3 days there.
I'm not sure how many people are in your party but we get Annual Passes. The Gold one comes with 2 free tickets, so 3 people get entry for the price of the Gold AP you also get 15% off dining (which includes all day dining) and merchandise.
Might be worth checking out as $600 is too much IMO.