lots of choices; as for dress code, you can wear jeans in all but one restaurant, dockers for the guys and capris for the gals are usually a little better choice. If dressing up is your thing, go for it, but don't think you have to. With the new restrictions on luggage more and more will choose not to pack the formal gear.
I think I mentioned this to you before, make sure you try Las Rambles for tapas. You can almost make a meal out of them. In fact on our first Sun cruise we did tapas and then just hit the buffet a little later. We had no reason for a full meal that night. On our second Sun cruise we did something similar, but after the tapsa settled we went to the sports bar for late sandwhiches.