Fountain and Cabana (pool bar) - Both have great burgers. Fountain has very good ice cream as well (IMHO - better than Beaches & Cream).
Garden Grove - very good w/e breakfast (with characters). Comparable to Fresh.
Fresh - excellent breakfast. Used to be an amazing brunch as well, but that is no longer offered.
BlueZoo, Shulas, Il Mulino - all excellent choices for a nice, albeit expensive, meal.
Haven't tried Picabu yet.