If you’re looking for the best rewards — in any credit card — you’ll want to first look at flexibility. Card issuers began dishing out rewards to build brand loyalty and incentivize customers to use their cards instead of cash. But over the years, some of these cards have become too specialized. That’s where flexibility comes into play. When you’re researching the best cruise line rewards program, you should first look at your preferred brand. After that, you should identify exactly how the card allows you to earn and redeem your rewards. Some will limit you so that you can only redeem your rewards for onboard credits. That could come in handy if you’re always on a ship — but most of us don’t have that luxury. The Princess Cruises Rewards Visa Card, for example, allows cardholders to redeem their rewards for discounted fares, upgrades, onboard credits, and even discounted airfare on any airline you choose. Still, you’ll find the point values decrease when you choose to redeem them for purchases with merchants other than the cruise line. That flexibility, though, makes the Princess card a top option.