Regent easily ranks tops on this list, and their fares include ... well, just about everything. Onboard the line's four all-suite ships, look for complimentary unlimited wifi, open bar, gratuities, specialty dining, and all activities (including fitness classes). You'll also get round-trip standard airfare on domestic flights from major U.S. hubs — or business class air on all intercontinental flights — plus airport transfers. In addition, the line includes shore excursions in every port, while those in Concierge-level suites and higher also get a one-night pre-cruise hotel stay.
Ca-ching!: You have to work pretty hard to run up a tab here — the only things you'll pay extra for are spa treatments, premium shore excursions, and some very top-shelf liquor.