On Carnival ships, all of your meals and entertainment are included in the cost of your fare, and that goes beyond the basics. In addition to breakfast, lunch, and dinner in the main dining room and buffet, you can eat burgers by the pool, soft serve in the evening, pizza late at night, and even barbecue on deck. You can also go to every stage show production, comedy act, and night club without paying an extra dime for admission. But that doesn't mean there aren't a lot of ways to upgrade your experience. Here, the ones we'd routinely pay extra money for — we feel they're worth every penny.