I recently returned from Carnival Destiny to the Southern Carribean. I too was worried about the dining attire; no sweat. Each night you eat in the fornal dining room there are certain loose "requirements." They advise no jeans, or flip-flop type sandals. On the formal nights, on the other hand, the passangers went all out. Some had on suits, and i even saw a girl wearing a prom dress. You said you don't like to dress up- So just be comfortable! When you eat buffet (breakfast, lunch, dinner, and midnight) nearly all attire is acceptable. The outfits ranged from full beach wear (ie swimsuit and flip-flops) to everyday lounge wear. Honestly, I noticed that other people aboard the ship are more concerned with themselves, and won't pick appart your choice of dress. Be comfy and have fun!!