My sister and I (age 26 & 29) love to do Afternoon Tea at the Grand Floridian. It's a must do for us each trip.
My sister's a huge fan of the glow drinks, but as we've learned they have them almost everywhere. This part trip she enjoyed the one at the Brown Derby (Page Turner Tini I think) the most, but all of them have been fine.
We're personally a fan of character meals but then we have fond memories of going to them with family. It doesn't seem like a trip without a visit to either 1900 Park Fare for breakfast (Mary Poppins, Alice, Mad Hatter, Tigger, and Pooh) or the Crystal Palace (Pooh, Piglet, Tigger, and Eeyore). As far as other meals go, we like Via Napoli in Epcot for pizza and the Brown Derby in Hollywood Studios. Generally, we like the quick service options more than the table service options in both the Magic Kingdom and Animal Kingdom. We really loved the look of Be Our Guest, but the service was eh--if it's possible to go for lunch by either using fastpass plus or getting there early, I'd say that is the better option.