Hi, Megan!
Oh...
dining at Downtown Disney is one of my favorite day / night events while visiting Walt Disney World.
There are so many fantastic meals at over a dozen Quick Service and Table Service throughout DD, so you'll simply have to pick the ones that seem the absolute best. (Determine this by looking at their menus, which you can find by clicking on the locations in the link above.) You can even find reviews and some photos of many of these locations at two unofficial websites: AllEars.net and DisneyFoodBlog.com.
Our family favorite restaurants are both created by the same chef. Wolfgang Puck Express at Downtown Disney Marketplace is a Quick Service location, but once you've placed your order, it eats and feels like a Table Service location. Servers will bring you your meals and refill your drinks, making this a much more relaxing location as soon as you've ordered. Some of our favorite WDW dishes come from this location; they are that good. Over at Wolfgang Puck Grand Cafe, you'll find an entirely different but spectacular menu, with creative, delicious dishes that will make you vow to return on your next visit, if not the next day.
At Paradiso 37, Taste of the Americas, you'll find many wonderful dishes, including my favorite, crazy corn. Seafood fans will love Fulton's Crab House, and Crossroads at House of Blues makes the most delicious cornbread and Lobster Mac and Cheese I've ever tasted. A quick sandwich at EARL OF SANDWICH will be great, too, especially if you are trying to save room for a decadent sundae at Ghirardelli Ice Cream & Chocolate Shop. (Do.Not.Miss.That. It could replace a meal, it's so good!)
Send more questions as you think of them, Megan; there are even more locations at DD that I didn't even get to yet, but are packed with choices you might love to sample. (Hmm...now I'm hungry...)