Honestly, I was disappointed in our SeaWorld. My son and I got to all the major shows, lunch and dinner, a lot of time in Shamu's Family Harbor, and the last 45 minutes in the baby area of the waterpark. You need 2 days to do all of SeaWorld. Bring cash ($5 to buy dolphin food) to feed animals. That was very cool. They confiscate straws. Consider smuggling food in--can't remember their food policy. Their prices are Disney high for food. 1 kid's meal (3 pices of chicken tenders plus fries), 1 kid's drink in Shamu cup, 1 adult regular drink, one taco salad, and one shamu bowl of cookies was a horrifying $26. We really liked the new Viva! show. The acrobats were really neat. My son honestly preferred i over Believe with the "Shamus", and so did I. Pirates in 4D was cute. It kind of startled my son though--but it's nice and cool in there. The waterpark isn't very large, but ok. The lazy river is pretty small. The kids play area is nice and safe and shallow with a really secure area. Even a nice changing area that offers privacy but allows parents to keep an eye on their other kids. Penguin and Reef areas are disappointing--your local zoo could have better. The clydesdales are nice and again the dolphin feeding area.
You could spend days doing the Alamo/ Riverwalk/ Mall/ IMAX/ Mercado/ Mission path. But one day should be plenty to see the Riverwalk/ Alamo/ IMAX/ shopping. In fact you could do it in a half day if you don't want to stroll the Riverwalk. But it's beautiful at night to eat. HTH!