Another option you have at Sea World is doing the Dolphins Up Close tour. Our family did it last week it was $50 per adult and $40 children 3-9 years old. It was pricey, but turned out to be a highlight of our trip.
We started out with a backstage look at Blue Horizons where we got an up close look at some of the training that goes on behind the scenes, and while we were there they were working with the false killer whale which was cool because that was my sons favorite part of the show.
We then got to see there animal care unit where they bring in new or injured dolphins. It's also right next to the manatee area for that as well so you get a peek at that as well.
Then we went over to Dolphin Cove and were broken up in to small groups (seemed like by family) and a trainer showed us things they do to work with the dolphins. All the while we had plenty of chances to touch, pet, and give rub downs to our dolphin.
The whole tour only lasted about 30 minutes, but the price to value ratio seemed worth it.
Be careful though, all this did was make my wife want to do Discovery Cove on our next trip, that means I'm gonna have to do some extra over time come next fall