Why: On this ship, marketed primarily to U.K.-oriented cruisers, the fitness facility and spa are more than adequate -- but it's the fun stuff that takes Ventura over the top. Within its gym, Ventura sports Tixter bikes, the latest in indoor cycling. The bikes have movable handlebars to mimic real-world biking and cycling routines (complete with video) from scenic roadways in the Scottish highlands to deserts, highways and city centers. It's like a PlayStation or Wii Cycling.
But the best fitness feature is Cirque Ventura, where passengers can try bouncing and flipping on a bungee trampoline or attend circus-school workshops led by skilled performers. Have a go at walking the tight wire, flying trapeze, clowning, juggling and stilt walking -- all at sea. It's a great workout and fun besides.
Best Land-Based Workouts
The Line: Norwegian Cruise Line's Pride of America
Why: Hawaii is one of the best destinations for active pursuits, and NCL's Pride of America is the only ship to sail year-round seven-night cruises to the islands, visiting gorgeous places like Maui, Kauai, Kona and Honolulu. You can go for a rainforest and waterfall hike, learn to surf or windsurf, golf at beautiful seaside courses, bike down the slopes of a dormant volcano, kayak through a wildlife refuge, scuba or snorkel, and take a horseback ride by the beach.
Best for Cyclists
The Line: Ocean Village
Why: Ocean Village -- a casual, sporty British cruise line -- actually carries its own mountain bikes onboard, earning it our vote for best cruise line for cyclists. The line offers guided bike rides in most destinations, and the four-hour rides include road cycling and some off-roading. Whether you're a novice but enthusiastic cycler or an experienced racer, there will be a biking excursion for you. The only requirement -- you have to be at least five feet tall.
The Line: Crystal Cruises
Why: Crystal makes more use of its ships' wrap-around promenades than most cruise lines with two innovative programs for walkers. The first, called Walking on Water (WOW) is a fitness program designed exclusively for Crystal. The program utilizes cotton vests that have pockets for weights, so walkers can increase their resistance training when striding around the promenade deck. Passengers can also make use of motivational music, day-by-day walking programs and instructions on how to use the vests safely and effectively.
Crystal also offers Nordic Walking through a partnership with LEKI USA. Guests will have complimentary use of walking poles for a low-impact, full-body workout. Grab some polls and don a vest, and those other shipboard walkers are sure to be intimidated by your power and energy!
Best Top-Deck Activities
The Line: Royal Caribbean