daughter did Marine Mammal Keeper last year in Orlando when she was 14..she went alone. There were two other people participating. That's the daily max....
http://commerce.4adventure.com/eStore/scripts/skins/swf/ToursAndInteractiveprograms.aspx
it's $400 bucks.....
You begin before the park opens and it ends about 2pm. Program includes lunch.
I think your exact animal interactions can change but she got close up time with Belugas, fed the dolphins & the sea lions, and watched manatee's ummmm..... 'react' to their medical examination

. No real orca time.....
She enjoyed it but must have begun to appreciate the value of a dollar cuz when asked if she wanted to do it agin this year for her birthday she said no, she was a bit disappointed with the amount of animal interaction; that there was actually a lot of standing around...didn't think it was worth the $ to go again.
But she likes wearing they t-shirt they gave her!