It is definitely not too cold to swim on an Alaskan cruise, though the experience is quite different from a Caribbean sailing. Most modern cruise ships designed for Alaskan itineraries come equipped with heated pools and multiple hot tubs. Many high-end vessels, such as those from Royal Caribbean or Celebrity, feature an "Aquadome" or a glass-enclosed Solarium, allowing passengers to swim in a climate-controlled environment while watching glaciers pass by outside. Even on ships with outdoor pools, the water is usually kept at a very warm temperature, often around 27°C to 29°C (80°F to 84°F). The "polar plunge" effect of jumping into a warm pool while the air temperature is a crisp 10°C (50°F) is actually a highlight for many travelers. However, the walk from the pool back to your towel or the indoor changing area can be freezing, so it is essential to have a thick robe ready. Many people prefer the hot tubs, which stay around 38°C (100°F), providing a perfect vantage point for wildlife spotting without feeling the Alaskan chill.