My daughter wrote about the Magic when she was assigned a paper on "The Best Vacation Ever." What really amazed me was her creativity--she described in detail the boarding process and arriving in the cabin and ended with something about "when you enter your cabin and smell the ocean mixed with just a hint of soap, you know you're about to have the best vacation ever." Not a word about the cruise or even the ship leaving port! It was excellent from the creative twist.
I'm not suggesting you do that, but my point is that you want to narrow your topic and then do something "different" or "creative" with it but be careful that you precisely follow the assignment. SLOW down when you speak.
If it is "an informative speech," choose one aspect of
DCL. Do you want to talk about the physical aspects of one of the ships? The evolution of the cruise line (beginning, increasing diversity of cruise locations, new ships), the experience of being a guest (or a CM) on the ship, how to book a cruise, how to choose a cruise, etc. Or what makes DCL different? Why cruise DCL? The seamless service available from boarding to arrival at port...or the land/sea combination?
Narrow topic, no more than 3 or 4 key points.....speak slowly....