Ham & Cheese Croissant-wiches. When is a sandwich more than just sliced bread and filling? When it's Royal Caribbean's addictive ham and cheese mini-croissant, a flaky, cheese-y, three-bite morsel topped with lettuce, tomato, mustard and mayo. The fee-free mini-wich has long been a staple in Royal Caribbean's signature 24-hour Cafe Promenade.
Big-Screen Wii Battles. If you've been honing your video-gaming skills, but never had an audience who could appreciate your expertise, you're in luck. The entire Norwegian Cruise Line fleet is outfitted with Nintendo's interactive gaming system, Wii.
Surfing at Sea. At-sea surf simulators first debuted on Freedom of the Seas, offering passengers a chance to surf and boogie-board, minus the ocean. It's now on a number of ships throughout the Royal Caribbean fleet.
AquaSpa Cafe. With its AquaSpa Cafe concept, Celebrity Cruises is out to prove that healthy cruising is not an oxymoron. The bathrobed, post-gym or -spa treatment crowd flock to the fee-free venue, which proffers salads, sushi and other light-fare foods alongside a few a la carte items (grilled pork, poached salmon). The standard location, Celebrity's lovely adults-only, glass-covered Solarium, provides just the right backdrop for the guilt-free offerings.
Poolside Milkshakes. Most ships do free soft-serve ice cream, but Oceania Cruises steps it up a notch with three flavors of milkshakes (vanilla, chocolate and strawberry) made to order by the pool deck.
Outdoor Movies. The flicks may not be first-run, but admission is free, and you can bring in treats from your cabin or the buffet without having to smuggle them under your jacket.
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Broadway Onboard. In the mood to see a Broadway show without paying Broadway ticket prices? You're in luck. Check out "Hairspray" on Royal Caribbean's Oasis of the Seas, "Chicago" on Allure of the Seas, "Saturday Night Fever" on Liberty of the Seas, "Rock of Ages" on Norwegian Breakaway or "Legally Blonde: the Musical" on Norwegian Getaway.
Mini-Golf. For anyone who wants to avoid crowds and catch some sun without lazing by the pool, top-deck mini-golf is a great option -- and it's free. Offered on some Royal Caribbean, Carnival, Disney, Princess and MSC ships, to name a few, the courses generally aren't a full 18 holes.
And there is always People Watching, Reading a Book, and dozens of other free things to do on a cruise!