The Key bundles priority boarding, reserved show seats, and VOOM Wi-Fi for regular staterooms. I walk through the per-person math and who should skip it.

The Unlimited Dining Package pays off at about five or six specialty dinners on a 7-night cruise. I break down what it covers, what costs extra, and how to run the numbers.

Carnival Faster to the Fun is priced per stateroom, so it is a strong buy for families in one cabin and a weak one for couples on short sailings. Here is what it includes and who already gets it.