Make the most of days at sea with these cruise tips.

On almost every cruise there are days at sea, when the ship doesn’t stop in any port of call. Cruise ships, with their expansive outdoor facilities, have plenty of ways to keep you entertained (including sundecks that stretch three football fields long and multiple swimming pools). You’ll find that days at sea also are perfect for enjoying the great indoors. Your ship undoubtedly has many indoor attractions in addition to the spa, restaurants, and shops you saw on your initial tour—some have video arcades, shopping boulevards, and caviar-and-wine bars.