A cruise ship or cruise liner is a passenger ship used for pleasure voyages, where the voyage itself and the ship's amenities are part of the experience, as well as the different destinations along the way. Transportation is not generally the prime purpose, as cruise ships operate mostly on routes that return passengers to their originating port, so the ports of call are usually in a specified region of a continent. Cruise ships tend to offer a wide range of facilities and activities; spas, swimming pools, water slides, rock climbing, ice skating, plays and performances, etc.