If you wanna eat "big," and TS, like you say, check times.
Cape May?
Also, note that the Swolphin joints won't take dp credits. I'd wholeheartedly endorse Kimonos at Swan, but I don't think they are open at that time.
Fuel's sandwiches are indeed outstanding, but thats not ts. (Damn fine sandwiches, though)
Fountain, is very casual, diner food and ice cream treats.
For $$, check Shulas, Bluezoo, and Il Mulino for meal times.
Cape May might just fit your bill.
LOL - ETA a few min later - Most of these won't be open. Cape May, All the Sigs at Swolphin - not open until 5pm.
Fuel, Picabu, Fountain will be Easy Peasy for you.
If you wanted to stay at Swolphin, honestly, I'd probably get a big ol sammich at Fuel. Fountain is decent, but it's odd in that it's a diner themed restaurant in the middle of hotel walkways. Picabu is decent also, but it kinda feels basement cafeteria-ish. Decent food and good prices at Picabu tho. Cabanas might be open for dining by the pool.
I'd go to Fuel for convenience - maybe a sundae at Fountain if you're feelin it. But Fuel might still have a self serve froyo station. Fuel is basically a grab and go, but they'll make you some really good hot deli sandwiches, and they have some tables for seating. Not TS, not fancy, but that would be my choice over Fountain or Picabu. I do like both Fountain and Picabu, but those sandwiches at Fuel are better eats for the money, imo.