My trip report from August 2014 included several photos and a full write up of the all day dining plan at Aquatica, if you would like to check it out. You can find it here:
http://www.disboards.com/threads/su...-summertime-sabbatical-at-svr.3303855/page-31
...and the all day dining pics are featured in post 611.
Your other option for food is the Waterstone Grill. We have also eaten there on past Aquatica trips, and the Waterstone Grill is a nicer dining option than the Banana Beach Buffet. Its less chaotic, you can take your food out of the dining area and back to your beach chair or cabana, and the food itself is better quality (though still Quick Service....definitely not fine dining any way you slice it). But, its generally a little more expensive than the buffet unless you don't plan to eat more than one meail while you're at the park. Banana Beach Buffet is a better "value" (all you can eat all day long), but Waterstone Grill has a nicer atmosphere and better food.
If you are considering locker rentals:
http://aquaticabyseaworld.com/en/orlando/park-info/know-before-you-go/?m=1
Lockers
Self Service ALL-Day rental for a small locker is $10 and large locker is $15. Three Self Service Rentals are located throughout the park: by IHU Breakaway Falls next to Kata's Kookaburra Cove, near Walkabout Waters across from Adaptations gift shop and at our Main Locker location across from Kiwi Traders gift shop. Picnic lockers are available at the front gate and must be rented from a ticket booth. Picnic lockers are also ALL-Day access and are $20 + a $10 key deposit. Prices are subject to change; please check park for updates.
....and towel rentals (quoted by Jessica as $5 each), I would suggest you also price out a cabana rental. It comes with a supply of rental towels (6 or 8), a large locker inside your cabana PLUS 12 bottles of Dasani water, your own fridge in the cabana, and the private space for the day. You also get 20% off in park purchases on the day of your rental (souvenirs, photos, etc.). Some of the November and December cabanas are only $49, so when you factor in the price you would already pay for a locker rental and towels, and your supply of waters for the day, the cabana would be almost be free (and they are sooooo nice to have.....the best splurge ever).
Aquatica is a great park, our favourite waterpark in Orlando (just a smidge ahead of Typhoon Lagoon for us....it edges into first place for Roa's Rapids and their affordable cabanas). I am sure you will love it!