I did CareerCamp about ten years ago at Sea World's San Antonio park. Now, they may have changed the program some since then, but I thought it was a very valuable experience!
When I did it, we spent a lot of time working with the animal training & care staff. Each day, we'd work with a different department. Most of the days, we got to help with fish breakout and food prep (which I'm sure was nice for the folks who do it daily to have twelve or thirteen students helping out!). Then we'd get to help feed in most areas as well.
In Texas, they had dorms on site where we stayed. It may be different at the Orlando park (I know that when I was in elementary school, I did a lot of day camps and sleepover camps in Orlando... on those, we sacked out in the exhibits).
There were lots of opportunities to interact with the animals, but most were at the surface (aka: no swim). That may not be the case here and now, though (this WAS a ten years ago!)
All in all, I think it was the best week I'd ever spent. Learned quite a lot! If they offered it for adults, I'd surely do it again!
Oddly enough, I was just going through my old photo albums last night and scanning some of the photos from that trip. Weird timing!
=)