Are all ships fairly similar?

Far from it. CLIA member lines' ships range from intimate and yacht-like to vessels stretching longer than three football fields.  You can sail with fewer than 100 fellow guests or with more than 4,300.  Enjoy atmospheres ranging from casual to formal, contemporary to classic.  You can even choose sail-assisted ships.  Enjoy the endless activities offered on a contemporary resort-style cruise, or immerse yourself in the culture of a destination on a special interest cruise.  You can view profiles of many of the types of ships by clicking here.