Cruise lines have started sweetening their deals by throwing in perks you typically have to pay extra for, such as Wi-Fi, drink packages, specialty dining, and even gratuities. "We started seeing this type of deal through Norwegian last fall," says Jaymie DeGaetano, deals production manager for ShermansTravel Media. "And now other lines have started their own programs." You can find limited-time "pick-your-perk" offers from major lines such as Celebrity Cruises, Holland America Line, Princess Cruises, and Oceania Cruises. But how do you know which promotion will save you the most money on your cruise? Read on to find out.