What to Pack

Although you will naturally pack differently for the tropics than for Alaska, certain packing rules apply to all cruises: Always take along a sweater in case of cool evening ocean breezes or overactive air-conditioning. A rain slicker usually comes in handy, too, and make sure you take at least one pair of comfortable walking shoes for exploring port towns.

Shorts or slacks are convenient for shore excursions, but remember that in Asia and Latin America women are expected to dress modestly and men to wear slacks. If you are going to Asia and plan to visit any holy places, both men and women will need a pair of slip-off shoes and garments that cover their knees (although these are usually available for rent at the site for a nominal charge). For European ports of call, pack as you would for any American city: casual clothes by day, dressier fashions for going out on the town at night. For visits to churches, cathedrals, and mosques, avoid shorts and other outfits that could be considered immodest: In Italy, women should cover their shoulders and arms (a shawl will do). In Turkey, women must have a head covering; a long-sleeve blouse and long skirt or slacks are also required.

Most cruise lines have dress codes for dining that vary during the cruise. To prepare for formal evenings, men should pack a dark suit, a tuxedo, or a white dinner jacket. Tuxedo rentals are offered on many ships. Women should pack one long gown or cocktail dress for every two or three formal evenings on board. Most ships have semiformal evenings, when men should wear a jacket and tie and women a dress or skirt and blouse. Ships will often suggest attire for their particular theme nights, with information available before the cruise. A few lines have no dress codes or guidelines. Check individual cruise lines for dress codes and packing guidelines.

Generally speaking, plan on one outfit for every two days of cruising, especially if your wardrobe contains many interchangeable pieces. Ships often have convenient laundry facilities as well. And don't overload your luggage with extra toiletries and sundry items; they are easily available in port and in the ship's gift shop (though usually at a premium price). Soaps, and sometimes shampoos and body lotion, are often placed in your cabin compliments of the cruise line.

Take an extra pair of eyeglasses or contact lenses in your carry-on luggage. If you have a health problem that requires a prescription drug, pack enough to last the duration of the trip or have your doctor write a prescription using the drug's generic name, because brand names vary from country to country. Always carry prescription drugs in their original packaging to avoid problems with customs officials. Don't pack them in luggage that you plan to check in case your bags go astray. Pack a list of the offices that supply refunds for lost or stolen traveler's checks.