Are you going to any parks? If so, which one(s)?
If you're not going to a park, Downtown Disney has tons of places to go as well as entertainment for the rest of the day.
I've eaten at:
DTD:
Cap'n Jacks
Earl of Sandwich
Planet Hollywood
and I've eaten at the Rainforest Cafe at Animal Kingdom, but I'm pretty sure there's no difference between the one there and DTD.
Magic Kingdom:
CRT- It's nice, but the food wasn't great. I haven't been there recently, so the menu might've changed.
Liberty Tree Tavern- a lot of people don't like the food, but I think it's fine.
Tony's Town Square
Animal Kingdom-
Rainforest Cafe
Tusker House
Hollywood Studios:
Sci Fi
Prime Time
EPCOT:
Nine Dragons in China (the banana eggroll for dessert was amazing)
Garden Grill
Coral Reef
Resorts:
Chef Mickeys - Contemporary
Cape May Cafe- Beach Club
ESPN Club- Boardwalk
Spoodles-""
Mickey's Backyard BBQ-Fort Wilderness
Ohanas- Poly
Turf Club Bar and Grille- Saratoga Springs
Captain's Grille- Yacht Club
Out of those, my favorite was probably Nine Dragons, just for the banana eggroll itself

My least favorites were probably Sci Fi and Tony's. Sci Fi is fun, but I didn't like my dinner.