Carnival's rules just went affect while Royal Caribbean's ban has been in place longer but has some exceptions.

Optional extras available to purchase on a cruise can really add up. From drink packages and specialty dining to spa services and shore excursions, add-ons that you can purchase to make your cruise vacation feel more all-inclusive can also make it much more expensive.

While some guests would prefer if this comfort beverage brand was offered, most thought it was completely unnecessary.

On Royal Caribbean’s ships, Starbucks drinks are not included in any drink package, while hand-crafted beverages from Café Promenade (which use Starbucks coffee) are. Plus, the beverages sold at Starbucks are significantly more expensive than comparable drinks served at the alternative.