There is always something fascinating about the sea creatures and Seaworld is a good place to learn about them. It has a little of everything for everyone. The penguins, the sea lions (I love the show !), the polar bears, the manta rays, Shamu, Kraken (roller coaster), etc. Just be careful that you might get wet. :)
The park was not as crowded as I would expected. There was no need to 'rush' to enjoy everything before the day ends. The park was not that big, but the layout was a bit confusing. You probably need to spend a few minutes to get used to it.
Although there are lots of things you could do in the here, I would suggest you to put the live show on top of the priority list, especially the Sea Lions and Shamu show.
For a theme park, the food here was quite good.
If you love the sea or animals, and you are in Orlando, the Seaworld Orlando is the place to go.