One of the best places for info is right here!
I have been to Sea World for years. It definitely is a relaxing park. We always go early and go directly to the ride parts. Kraken and Atlantis should be done early to avoid lines.
Clyde and Seamore is a comedic show...corny, but cute. And go early!!! The crowds fill up the stadium and there is a mime that performs right before the show and is very funny.
Wild Arctic is great. They have both a ride or just a walk through tour if you like.
I also love to visit the manatees and the penguins.
Also, look into the behind the scenes tours. They are relatively inexpensive and I think, worthwhile.
Any other questions, don't hesitate to ask!