Details: A lot of vacations feel like a sprint; these are literally marathons. By the end of this cruise, you'll have run a total of 26.2 miles, broken up into segments on the ships' decks and on roads and trails in different ports of call. The July 2013 Alaska cruise from Seattle is on Holland America's Westerdam with running/walking in Juneau, Sitka, Ketchikan and Victoria; rates start at $1,786 per person for an inside cabin. Participants on either cruise must also pay a race registration fee ranging from $249 to $279.
Details: Boston Red Sox fans now have the opportunity to relive key moments -- "Slaughter's Mad Dash," "The Impossible Dream" and Carlton Fisk's game-winning home run in the 1975 World Series -- on the Boston Red Sox fan cruise aboard Celebrity Silhouette. On January 12, passengers will sail the Caribbean for seven nights with Red Sox legends (Keith Foulke, John Tudor and more) as well as WEEI broadcaster Joe Castiglione. Stops include Cozumel, Grand Cayman and Labadee, where an exclusive Red Sox beach party will be held. Onboard, passengers will be able to engage in a number of activities with the legends, including two exclusive cocktail parties, a karaoke night and martini tasting. Fares start at $910 for an inside cabin.