The all day dining at Aquatica gives you unlimited food for a very reasonable $17.99 per adult (less for kids). Its a good value.
That said, its not our first pick when dining at that park. We much prefer the a la carte options at the Waterstone Grill (burgers, chicken tenders, etc.). The food is fresher and better quality, and we like the ambiance better (plus, you can take it to wherever you wish to eat it in the park.....for example, to your cabana if you have one or to your beach chair...you are not restricted to dining at the restaurant).
The all day dining at Aquatica is offered at the Banana Beach Cook-out. Its one location only. All food must be consumed within the restaurant boundaries. There are staff monitoring guests coming in and out.
The Banana Beach Cook-out offers two separate options...a one-visit option or an all-day option. If you purchase the one-visit option initially then decide you want to go back for a second round of food, they will upgrade you for the difference in price as long as you have your receipt from your initial visit that day.
Food is okay....nothing to knock your socks off, but nothing awful either. Pizza, pulled pork, hot dogs, barbecued chicken legs, garlic rolls, watermelon, and chocolate cake (un-iced) are some of the things that come to mind that were on the buffet on our initial visit (when we had the free all day dining via our Seaworld vacation package). All drinks are Coke products and are self-serve.
If there's anything I haven't mentioned that you are wondering about, feel free to ask.