Should You Book A Cruise Excursion With Your Cruise Line? The seven pros and five main cons are discussed by Gary Bembridge, cruise expert and author. Many people rely on the port excursions that the cruise line offers when deciding what to do in a port. But is this the best and cheapest option available to you. Discover the benefits of going with the cruise line, and the reasons not to - so you can make the right choice for you.