Most of the major cruise lines have facilities for doing coaching programs or seminars at sea. A lot depends on what your tastes are, who you are marketing to, budget and destinations. Each line has their own culture and demographics.
Royal Caribbean – if you have seen their ads, it’s about adventure. There are lots of activities such as roller skating, rock climbing, etc. RCCL is very family friendly and promotes an active lifestyle. Staterooms are average size, and food is generally very good.
Celebrity Cruises – this is a sister company to Royal Caribbean. They are a little more upscale, smaller ships, and there is more of a focus on elegant food and artwork.
Carnival Cruise Line – these are the fun ships. Waterslides, people of all ages, and lots of kids. Carnival caters to all people in all price ranges.
Norwegian Cruise Line – NCL prides themselves in offering alternatives especially in the dining arena. Where most cruise ships have one or two large dining rooms, NCL has an assortment of theme restaurants on most of their ships – Japanese, steak, italian, etc.
Princess – they still get called the Love Boat, but Princess is generally focused on middle age and older adults. They tend to have some of the largest cabins, and currently they have the highest percentage of balcony staterooms. This is largely since their destination focus is places where you want to be outside looking at scenery like Alaska and the Mediterranean.
There are several other cruiselines that also are good choices for seminars and presentations. Let us know what you are looking for.