SeaWorld is less crowded, more relaxed, and more show-driven than the Disney parks. Unfortunately, you can't get the exact show schedules now; you might get them a couple of days beforehand online, but that's it. But here are some tips:
1. Immediately on entering the park, grab a map. The show schedule is on the back. You can plan from there.
2. Arrive early, bang a left towards Key West, and visit the dolphins and rays first. They are more active and less jaded for the first feeding. You can queue up to feed the dolphins ($5 for 3 fish) or just watch others feed them for free.
3. From the dolphins, its easy to do the two big thrill rides, Kraken and Journey to Atlantis, before they get too crowded. Front left seat on Atlantis gets you soaked!
4. Wild Arctic is directly across from Shamu's main entrance; so do Wild Arctic during a Shamu show, don't even think about it after one.
5. For Believe! (Shamu), you have a choice-- getting completely soaked with cold saltwater or not. For a soaking, sit 1/2 way between the center and edge of the stage arc, on either side, in the first 10 rows. To stay dry anywhere in the top deck will do.
6. If you have little kids, you can kill time waiting for Shamu at the Happy Harbor area.
7. Arrive early for the Clyde and Seamore sea lion show -- the mime who works the crowd beforehand is half the fun!
8. Pets Ahoy is in an air-conditioned theater. This and Wild Arctic are good places to beat the heat in the middle of the afternoon.
Have a good trip!