Hi SimbaOne
It's a couple of years since I've visited Sea World (more of a Universal fan myself!) but you have the show with shamu in the day and on an evening. But after the evening show about 9pm they used to have Shamu Rocks.... or something like that. Rock music, lights etc. I seem to remember it's kind of short but great to watch. I seem to recall it may only have been on Saturday nights.... may be someone who's been recently can confirm this for you.
Go see Clyde and Seamore it's really funny... again the show has changed since I saw it but they are great. Plus they usually have this chap who's a mime artist, I know sound naf, but he takes the micky out of people as they arrive, it's really funny.
Hope this isn't too late for your vacation!
Have a great time!
Juggler