For breakfast at RPR, you have two choices: the breakfast buffet at the Island Dining Room (around $15 per person) or a continental breakfast at the Orchid Court Lounge. For sweet tooth people, there's a Cinnabon located at Citywalk and another one inside IOA. If you prefer breakfast sandwiches, those can be obtained at the Croissant Moon Bakery at IOA and the Beverly Hills Boulangerie at US.
For lunch, we grab a bite at Jake's American Bar (located at RPR) on our arrival day as it is usually around lunch time when we check-in. At IOA, we go to Mythos. We don't have a favorite restaurant at US. On the day we check-out, we eat lunch at one of the fine restaurants at Citywalk.
For dinner, we almost always eat at Citywalk. Usually on our arrival day, we'll splurge and eat at either Emeril's Restaurant at Citywalk or Emeril's Tchoup Chop at RPR. Both are expensive and have a dress code but have great food, atmosphere and service. The restaurants we've tried and liked at Citywalk are Margaritaville, Hard Rock Cafe and NBA City. The other restaurant we've dined at was Pastamore and we didn't like it. The service was fine but we thought that the food was bland.