For Active Explorers

Instead of shopping and visiting museums on this seven-day getaway (although you're free to do that as well), opt for a fitness-oriented tour of each port of call.

Ports of call Stockholm and Visby, Sweden; Tallinn, Estonia; St. Petersburg, Russia; Helsinki, Finland; and Copenhagen, Denmark

Get fit You can also take aerobics, Pilates, yoga and stretching classes in the fitness center. Did you notice some extra huffing and puffing on the land outings? Back on the ship, sign up for a fitness assessment and one-on-one workout with a personal trainer

Pamper yourself Although one half-hour massage is included in the rate, the spa -- operated by Carita of Paris, which runs similarly posh outposts all over Europe -- offers dozens of other treatments. Try the 75-minute Renovateur Satin Skin ($135), which includes a sunflower-seed exfoliation followed by a massage that you can opt to have done outside.

Details From $3,298; departs Copenhagen; reverse route sails from Stockholm.