Best Single Travel Cruise tip of the day....Know the dress codes. While some cruisers still like to dress to the nines (formal gowns and tuxedos) for ships' formal nights, most people dress in business attire (suit for men, cocktail garb -- flowing pants suits or silk dresses -- for women). The more contemporary the line -- like Carnival and Royal Caribbean -- the dressier folks are on formal occasions. If you love to dress up, know that some lines do offer tux rentals so you don't have to pack your own. Allergic to formal wear? Most cruise lines offer buffet-style dining for dinner, even on formal nights .