When choosing a cruise ship for your next vacation, there are an abundance of choices that you can make. However, there are a few things that only those who book a cruise on Carnival Cruise Line can take advantage of. Here are seven things that only a Carnival Cruise Line passenger can do. Choose From 15 Embarkation Ports in the U.S. Carnival Cruise Line offers cruises from 15 different embarkation ports in the U.S., that is more than any other cruise line. The more embarkation ports a cruise line offers, the less distance you have to travel to get to