Get to SWF at 08:30am so you're at the gate early, they open at 9am.
As you go into the park, head to the left. You'll pass the key west area. Let the 4 year old touch the sting rays, and if the dolphin feeding window is open, you can buy a cup of 4 fish for $4 and let them touch a dolphin. Bring lots of cash, because they'll want to do more than 1 cup.
Dolphin stadium is next to the key west area, and is the first show of the day, usually at 10am. Watch it, then continue to the Clyde and Seamore pirate show.
From there it's up to you, there's a bunch of things to see. Penguins, coral reef, manatees
Eat lunch early at 11am, because the lines for the restaurants get long at noon.
Many recommend the deli, located in the back corner of the park next to the Clydesdales. The kids will like looking at the horses, and you can get a few beer samples in the hospitality center.
After that you head for the Shamu show, and the play area behind the stadium, where you'll stay for a few hours.
Do the walkthru of the polar bear exhibit, which completes a lap around the park, and by then the kids will be zonked out.