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.

A sailing aboard one of Seabourn's six small ships already includes two of the biggest expenses upfront: staff gratuities and alcoholic beverages. Plus, they throw in add-ons like specialty restaurant dining, water sports from the ship's marina, and some fitness classes. 

Ca-ching!: The line includes some special events, too, such as the "Caviar in the Surf" beach barbecue in the Caribbean.

Read more: How to Get a Deal on Seabourn Cruise Line

Not only does Silversea bundle in gratuities and alcoholic beverages, but the cruise also includes great-value extras such as complimentary fitness classes, one hour of wifi per day, port shuttles, and specialty dining.

Ca-ching!: Silversea regularly offers regional promotions, with add-ons like shore excursions, pre-cruise hotel stays, and free or discounted airfare. In addition, the line's expedition arm has its own inclusions, such as shore excursions.

Viking Ocean Cruises passengers expect a shore excursion in each port; wifi; select beverages with meals (including beer, wine, and soft drinks) round-the-clock coffees and bottled water; and specialty dining. However, you'll have to pay for staff gratuities, any shore excursions beyond the one included offering, and liquor at the restaurants as well as drinks at bars). 

Ca-ching!: Viking offers one amazing perk — complimentary access to the LivNordic Spa, which just may be the most gorgeous spa at sea. 

On Oceania ships, there are no supplements for most specialty restaurants (including Jacques Pépin's bistro, but not La Reserve); non-alcoholic beverages; or onboard fitness classes. Plus, complimentary shuttle buses are provided in some ports.

Ca-ching!: The "OLife Choice" package option bundles in loads of extras for guests who pay a premium fare. These include airfare from some U.S. cities, unlimited internet access, and a choice of a beverage package, shore excursion bundle, or shipboard credit.